diff --git a/editor.planx.uk/src/@planx/components/Checklist/Editor/Editor.tsx b/editor.planx.uk/src/@planx/components/Checklist/Editor/Editor.tsx
index 49c592a064..067ed1e3e4 100644
--- a/editor.planx.uk/src/@planx/components/Checklist/Editor/Editor.tsx
+++ b/editor.planx.uk/src/@planx/components/Checklist/Editor/Editor.tsx
@@ -31,6 +31,7 @@ export const ChecklistComponent: React.FC<ChecklistProps> = (props) => {
       img: props.node?.data?.img || "",
       options: props.options,
       text: props.node?.data?.text || "",
+      exclusiveOrOption: props.exclusiveOrOption || undefined,
       ...parseBaseNodeData(props.node?.data),
     },
     onSubmit: ({ options, groupedOptions, ...values }) => {
diff --git a/editor.planx.uk/src/@planx/components/Checklist/Editor/Options.tsx b/editor.planx.uk/src/@planx/components/Checklist/Editor/Options.tsx
index 388c021dac..e0acc53085 100644
--- a/editor.planx.uk/src/@planx/components/Checklist/Editor/Options.tsx
+++ b/editor.planx.uk/src/@planx/components/Checklist/Editor/Options.tsx
@@ -2,6 +2,7 @@ import Delete from "@mui/icons-material/Delete";
 import Box from "@mui/material/Box";
 import Button from "@mui/material/Button";
 import IconButton from "@mui/material/IconButton";
+import MenuItem from "@mui/material/MenuItem";
 import adjust from "ramda/src/adjust";
 import compose from "ramda/src/compose";
 import remove from "ramda/src/remove";
@@ -9,8 +10,11 @@ import React from "react";
 import { FormikHookReturn } from "types";
 import ListManager from "ui/editor/ListManager/ListManager";
 import ModalSectionContent from "ui/editor/ModalSectionContent";
+import SelectInput from "ui/editor/SelectInput/SelectInput";
 import Input from "ui/shared/Input/Input";
 import InputRow from "ui/shared/InputRow";
+import InputRowItem from "ui/shared/InputRowItem";
+import InputRowLabel from "ui/shared/InputRowLabel";
 
 import { Option } from "../../shared";
 import type { Group } from "../model";
@@ -146,6 +150,33 @@ export const Options: React.FC<{ formik: FormikHookReturn }> = ({ formik }) => {
           editorExtraProps={{ showValueField: !!formik.values.fn }}
         />
       )}
+      {/* TODO: only show if more than one option */}
+      {formik.values.options && (
+        <Box pt={2}>
+          <InputRow>
+            <InputRowLabel>Exclusive or option</InputRowLabel>
+            <InputRowItem>
+              <SelectInput
+                name="exclusiveOrOption"
+                onChange={(e) => {
+                  formik.setFieldValue("exclusiveOrOption", e.target.value);
+                  // TODO: make it take effect
+                }}
+                value={formik.values.exclusiveOrOption || ""}
+              >
+                {formik.values?.options?.map((option: Option) => {
+                  const optionTitle = option?.data?.text;
+                  return (
+                    <MenuItem key={optionTitle} value={optionTitle}>
+                      {optionTitle}
+                    </MenuItem>
+                  );
+                })}
+              </SelectInput>
+            </InputRowItem>
+          </InputRow>
+        </Box>
+      )}
     </ModalSectionContent>
   );
 };
diff --git a/editor.planx.uk/src/@planx/components/Checklist/Public/Public.tsx b/editor.planx.uk/src/@planx/components/Checklist/Public/Public.tsx
index 23d9bdd2e4..d823065ef8 100644
--- a/editor.planx.uk/src/@planx/components/Checklist/Public/Public.tsx
+++ b/editor.planx.uk/src/@planx/components/Checklist/Public/Public.tsx
@@ -62,6 +62,7 @@ const VisibleChecklist: React.FC<Props> = (props) => {
     img,
     previouslySubmittedData,
     id,
+    exclusiveOrOption,
   } = props;
 
   const formik = useFormik<{ checked: Array<string> }>({
diff --git a/editor.planx.uk/src/@planx/components/Checklist/model.ts b/editor.planx.uk/src/@planx/components/Checklist/model.ts
index 1ac40a10ee..09f169cf59 100644
--- a/editor.planx.uk/src/@planx/components/Checklist/model.ts
+++ b/editor.planx.uk/src/@planx/components/Checklist/model.ts
@@ -23,6 +23,7 @@ export interface Checklist extends BaseNodeData {
   allRequired?: boolean;
   categories?: Array<Category>;
   neverAutoAnswer?: boolean;
+  exclusiveOrOption?: string;
 }
 
 interface ChecklistExpandableProps {
@@ -102,8 +103,11 @@ export const checklistValidationSchema = ({
   allRequired,
   options,
   groupedOptions,
-}: Checklist) =>
-  array()
+  exclusiveOrOption,
+}: Checklist) => {
+  const flatOptions = getFlatOptions({ options, groupedOptions });
+
+  return array()
     .required()
     .test({
       name: "atLeastOneChecked",
@@ -119,8 +123,27 @@ export const checklistValidationSchema = ({
         if (!allRequired) {
           return true;
         }
-        const flatOptions = getFlatOptions({ options, groupedOptions });
         const allChecked = checked && checked.length === flatOptions.length;
         return Boolean(allChecked);
       },
+    })
+    .test({
+      name: "notExclusiveOrSelection",
+      message: `Cannot select "${exclusiveOrOption}" alongside other options`,
+      // TODO: something more like 'Select countries you will be travelling to, or select ‘No, I will not be travelling to any of these countries’
+      test: (checked?: Array<string>) => {
+        const multipleSelectedOptionsIncludesExclusiveOr =
+          exclusiveOrOption &&
+          flatOptions.some((option) => {
+            const optionHasBeenPicked = checked?.includes(option.id);
+            return (
+              checked &&
+              optionHasBeenPicked &&
+              checked.length > 1 &&
+              option.data.text === exclusiveOrOption
+            );
+          });
+        return !multipleSelectedOptionsIncludesExclusiveOr;
+      },
     });
+};
diff --git a/editor.planx.uk/src/@planx/components/Checklist/types.ts b/editor.planx.uk/src/@planx/components/Checklist/types.ts
index 76ef9d47bd..920eee7d4d 100644
--- a/editor.planx.uk/src/@planx/components/Checklist/types.ts
+++ b/editor.planx.uk/src/@planx/components/Checklist/types.ts
@@ -14,6 +14,7 @@ export interface ChecklistProps extends Checklist {
       fn?: string;
       img?: string;
       text: string;
+      exclusiveOrOption?: Option;
     } & BaseNodeData;
   };
 }