Lots of places aren't actually where they say they are. Take Bournemouth, for example. Was in Hampshire, now Dorset. But as a unitary authority, now part of BCP (Bournemouth, Christchurch and Poole. Bournemouth Airport is in Christchurch, the main campus of Bournemouh University is in Poole and the Bournemouth Symphony Orchestra is based in Poole too.
On a railway note, back in the day of the Bournemouth Belle, it called at Bournemouth Central (then in Hampshire), entered Dorset briefly before turning to re-enter Hants at B'mth West. The present Bournemouth Traincare Depot actually straddles the old county boundary - one end of the carriage cleaning shed was in Hants, the other in Dorset.