My thanks to everyone who replied to my query. I was really trying to work out the likely place of birth for Samuel Williams conscience of the fact that I would never know for sure. The different places of birth noted in the census returns was confusing me. If I was born in Kensington I suppose I could say that I was born in London, Kensington or whatever parish Kensington falls into and they would all be correct but Kensington would be the most accurate. If Samuel had actually been born in the town of Longdon-upon- Tern I wonder why there would be later references to Withington and Wellington. I might just settle for the parish of Longdon-upon-Tern and be done with it.
Thank you all once again for your help. I had looked at Genuki Gadget but will go back with the leads you provided and do a bit more investigation.
Cheers
Ross