diff --git a/pacman/model/partitioner_splitters/abstract_splitter_common.py b/pacman/model/partitioner_splitters/abstract_splitter_common.py
index b5b9d11f5..cacbbfba5 100644
--- a/pacman/model/partitioner_splitters/abstract_splitter_common.py
+++ b/pacman/model/partitioner_splitters/abstract_splitter_common.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 from typing import (
-    Iterable, Generic, Optional, Sequence, Tuple, TypeVar, Union)
+    Iterable, Generic, Optional, Sequence, Tuple, TypeVar)
 from spinn_utilities.abstract_base import AbstractBase, abstractmethod
 from pacman.exceptions import PacmanConfigurationException
 from pacman.model.graphs import AbstractVertex
diff --git a/pacman/model/routing_info/vertex_routing_info.py b/pacman/model/routing_info/vertex_routing_info.py
index e25f5f4e3..8bb2d8d19 100644
--- a/pacman/model/routing_info/vertex_routing_info.py
+++ b/pacman/model/routing_info/vertex_routing_info.py
@@ -11,15 +11,13 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-from typing import Optional, Union
+from typing import Optional
 import numpy
 
 from spinn_utilities.abstract_base import abstractmethod, AbstractBase
 
 from pacman.exceptions import PacmanConfigurationException
 from pacman.model.graphs import AbstractVertex
-from pacman.model.graphs.application import ApplicationVertex
-from pacman.model.graphs.machine import MachineVertex
 
 from .base_key_and_mask import BaseKeyAndMask
 
diff --git a/pacman/operations/router_algorithms/application_router.py b/pacman/operations/router_algorithms/application_router.py
index da1bd10e1..f328374c8 100644
--- a/pacman/operations/router_algorithms/application_router.py
+++ b/pacman/operations/router_algorithms/application_router.py
@@ -14,7 +14,7 @@
 
 from collections import deque, defaultdict
 from typing import (
-    Deque, Dict, Iterable, Iterator, List, Optional, Set, Tuple, Union)
+    Deque, Dict, Iterable, Iterator, List, Optional, Set, Tuple)
 from typing_extensions import TypeAlias
 from spinn_utilities.progress_bar import ProgressBar
 from spinn_utilities.typing.coords import XY
@@ -150,8 +150,8 @@ def __add_m_vertices(
         for vtx in vertex.splitter.get_out_going_vertices(partition_id):
             self.__add_source(vtx, core, link)
 
-    def __add_source(
-            self, source: AbstractVertex, core: _OptInt, link: _OptInt) -> None:
+    def __add_source(self, source: AbstractVertex, core: _OptInt,
+                     link: _OptInt) -> None:
         """
         :param source:
         :param core: