diff --git a/app/models/info_request.rb b/app/models/info_request.rb
index d54b029f82..d6eb8f834a 100644
--- a/app/models/info_request.rb
+++ b/app/models/info_request.rb
@@ -187,6 +187,7 @@ class << self
   before_create :set_use_notifications
   before_validation :compute_idhash
   before_validation :set_law_used, on: :create
+  after_create :notify_public_body
   after_save :update_counter_cache
   after_update :reindex_request_events, if: :reindexable_attribute_changed?
   before_destroy :expire
@@ -1899,4 +1900,8 @@ def reindexable_attribute_changed?
       saved_change_to_attribute?(attr)
     end
   end
+
+  def notify_public_body
+    public_body.request_created
+  end
 end
diff --git a/app/models/public_body.rb b/app/models/public_body.rb
index a8bd7c005d..52032ab319 100644
--- a/app/models/public_body.rb
+++ b/app/models/public_body.rb
@@ -61,6 +61,9 @@ def self.admin_title
     ]
   end
 
+  # Set to 0 to prevent application of the not_many_requests tag
+  cattr_accessor :not_many_public_requests_size, default: 5
+
   has_many :info_requests,
            -> { order(created_at: :desc) },
            :inverse_of => :public_body
@@ -113,7 +116,7 @@ def self.admin_title
 
   before_save :set_api_key!, :unless => :api_key
 
-  after_save :update_missing_email_tag
+  after_save :update_auto_applied_tags
 
   after_update :reindex_requested_from
 
@@ -927,6 +930,10 @@ def questions
     PublicBodyQuestion.fetch(self)
   end
 
+  def request_created
+    update_not_many_requests_tag
+  end
+
   private
 
   # If the url_name has changed, then all requested_from: queries will break
@@ -977,6 +984,11 @@ def self.get_public_body_list_translated_condition(table, has_first_letter=false
     result
   end
 
+  def update_auto_applied_tags
+    update_missing_email_tag
+    update_not_many_requests_tag
+  end
+
   def update_missing_email_tag
     if missing_email? && !defunct?
       add_tag_if_not_already_present('missing_email')
@@ -988,4 +1000,12 @@ def update_missing_email_tag
   def missing_email?
     !has_request_email?
   end
+
+  def update_not_many_requests_tag
+    if info_requests.is_searchable.size < not_many_public_requests_size
+      add_tag_if_not_already_present('not_many_requests')
+    else
+      remove_tag('not_many_requests')
+    end
+  end
 end
diff --git a/app/views/admin_public_body/_form.html.erb b/app/views/admin_public_body/_form.html.erb
index ff57155484..6d0f29841f 100644
--- a/app/views/admin_public_body/_form.html.erb
+++ b/app/views/admin_public_body/_form.html.erb
@@ -63,6 +63,7 @@
         <li><code>charity:NUMBER</code> if a registered charity</li>
         <li><code>important_notes</code> if the notes have major implications on making a request to this authority</li>
         <li><code>missing_email</code> is automatically applied (and removed) so that users can help source missing request addresses via a <%= link_to 'public search', list_public_bodies_by_tag_path('missing_email') %>.</li>
+        <li><code>not_many_requests</code> is automatically applied (and removed) so that users can find low-transparency bodies via a <%= link_to 'public search', list_public_bodies_by_tag_path('not_many_requests') %>.</li>
       </ul>
     </div>
   </div>
diff --git a/doc/CHANGES.md b/doc/CHANGES.md
index bfbcd32b80..afeb503252 100644
--- a/doc/CHANGES.md
+++ b/doc/CHANGES.md
@@ -2,6 +2,9 @@
 
 ## Highlighted Features
 
+* Automatically apply `not_many_requests` tag to bodies who don't have many
+  public requests so that they can be found in a public list or have tag-based
+  notes applied (Gareth Rees)
 * Fix categorisation game total requests count (Gareth Rees)
 * Add count of requests in each prominence state to body and user admin pages
   (Gareth Rees)
@@ -37,6 +40,12 @@
 
       bin/rails runner "PublicBody.without_request_email.each(&:save)"
 
+* _Optional:_ Bodies with not many requests will automatically get tagged
+  `not_many_requests` as they are updated. If you want to automatically tag them
+  all in one go, run the following from the app root directory:
+
+      bin/rails runner "PublicBody.where('info_requests_visible_count < ?', PublicBody.not_many_public_requests_size).each(&:save)"
+
 * The crontab needs to be regenerated to include the new modifications:
   http://alaveteli.org/docs/installing/manual_install/#generate-crontab
 
diff --git a/spec/controllers/admin_public_body_controller_spec.rb b/spec/controllers/admin_public_body_controller_spec.rb
index 2f05087ff9..82c83aac25 100644
--- a/spec/controllers/admin_public_body_controller_spec.rb
+++ b/spec/controllers/admin_public_body_controller_spec.rb
@@ -673,7 +673,7 @@
     end
   end
 
-  describe "DELETE #mass_tag" do
+  describe "DELETE #mass_tag", not_many_requests_tag: false do
     it "mass removed tags" do
       body = FactoryBot.create(:public_body, tag_string: 'department foo')
       expect(PublicBody.find_by_tag("department").count).to eq(1)
diff --git a/spec/lib/public_body_csv_spec.rb b/spec/lib/public_body_csv_spec.rb
index d070762d4f..3c77b20095 100644
--- a/spec/lib/public_body_csv_spec.rb
+++ b/spec/lib/public_body_csv_spec.rb
@@ -1,7 +1,6 @@
 require 'spec_helper'
 
-RSpec.describe PublicBodyCSV do
-
+RSpec.describe PublicBodyCSV, not_many_requests_tag: false do
   describe '.default_fields' do
 
     it 'has a default set of fields' do
diff --git a/spec/models/info_request_spec.rb b/spec/models/info_request_spec.rb
index 8da8fb08f7..a55b94e9c8 100644
--- a/spec/models/info_request_spec.rb
+++ b/spec/models/info_request_spec.rb
@@ -3307,6 +3307,17 @@ def create_old_unclassified_holding_pen
       expect(info_request).to receive(:update_counter_cache)
       info_request.save!
     end
+
+    it 'notifies the public body when created' do
+      expect(info_request.public_body).to receive(:request_created)
+      info_request.save!
+    end
+
+    it 'does not notify the public body when updated' do
+      info_request.save!
+      expect(info_request.public_body).not_to receive(:request_created)
+      info_request.save!
+    end
   end
 
   describe 'when changing a described_state' do
diff --git a/spec/models/public_body_spec.rb b/spec/models/public_body_spec.rb
index e27207fc76..9f8daf256f 100644
--- a/spec/models/public_body_spec.rb
+++ b/spec/models/public_body_spec.rb
@@ -230,6 +230,31 @@
         expect(public_body).not_to be_tagged('missing_email')
       end
     end
+
+    context 'when there are not many public requests' do
+      let!(:public_body) { FactoryBot.create(:public_body) }
+
+      it 'adds the not many requests tag' do
+        subject
+        expect(public_body).to be_tagged('not_many_requests')
+      end
+    end
+
+    context 'when a request email is removed' do
+      let!(:public_body) { FactoryBot.create(:public_body) }
+
+      # Reduce size for test so we have to create fewer records
+      before { public_body.not_many_public_requests_size = 2 }
+
+      before do
+        FactoryBot.create_list(:info_request, 2, public_body: public_body)
+      end
+
+      it 'removes the not many requests tag' do
+        subject
+        expect(public_body).not_to be_tagged('not_many_requests')
+      end
+    end
   end
 
   describe '#name' do
@@ -979,8 +1004,7 @@
 
   end
 
-  describe 'when generating json for the api' do
-
+  describe 'when generating json for the api', not_many_requests_tag: false do
     let(:public_body) do
       FactoryBot.create(:public_body,
                         :name => 'Marmot Appreciation Society',
@@ -1344,7 +1368,7 @@ def set_default_attributes(public_body)
 
 end
 
-RSpec.describe PublicBody, " when loading CSV files" do
+RSpec.describe PublicBody, " when loading CSV files", not_many_requests_tag: false do
   before(:each) do
     # InternalBody is created the first time it's accessed, which happens sometimes during imports,
     # depending on the tag used. By accessing it here before every test, it doesn't disturb our checks later on
@@ -2355,6 +2379,36 @@ def set_default_attributes(public_body)
         to change { public_body.info_requests_visible_count }.from(1).to(0)
     end
   end
+
+  describe '#request_created' do
+    subject { public_body.request_created }
+
+    context 'when there are not many public requests' do
+      let!(:public_body) { FactoryBot.create(:public_body) }
+
+      before { public_body.not_many_public_requests_size = 2 }
+
+      it 'adds the not many requests tag' do
+        subject
+        expect(public_body).to be_tagged('not_many_requests')
+      end
+    end
+
+    context 'when a request email is removed' do
+      let!(:public_body) { FactoryBot.create(:public_body) }
+
+      before { public_body.not_many_public_requests_size = 2 }
+
+      before do
+        FactoryBot.create_list(:info_request, 3, public_body: public_body)
+      end
+
+      it 'removes the not many requests tag' do
+        subject
+        expect(public_body).not_to be_tagged('not_many_requests')
+      end
+    end
+  end
 end
 
 RSpec.describe PublicBody::Translation do
diff --git a/spec/support/shared_context_for_not_many_requests_tag.rb b/spec/support/shared_context_for_not_many_requests_tag.rb
new file mode 100644
index 0000000000..effff6a069
--- /dev/null
+++ b/spec/support/shared_context_for_not_many_requests_tag.rb
@@ -0,0 +1,8 @@
+RSpec.shared_context 'disable not_many_requests tagging', not_many_requests_tag: false do
+  around do |example|
+    orig = PublicBody.not_many_public_requests_size
+    PublicBody.not_many_public_requests_size = 0
+    example.run
+    PublicBody.not_many_public_requests_size = orig
+  end
+end