https://www.ordnancesurvey.co.uk/election-maps/gb/
For the legal boundaries of civil parishes and communties, click the relevant option on the Ordnance Survey map.
Edit: This is the silliness you get when you do put "welcome to place" signs on parish boundaries... https://www.google.co.uk/maps/@55.204691...384!8i8192
RE: Go North East: Major Service Changes July 2022