Thank you all for the information you have all done fantastic look-ups for me.
I'll have a look on FindMyPast to see if they do have the records.
He isn't with his wife and children on the 1851 census I have looked so many times trying different combinations of his name, so maybe he's in an area where the damaged census wasn't able to be re-constructed.
The Thomas Pimlott death in 1858 sounds as if it would be him.
I didn't have him on the 1855 Slater's directory.

Cheers
Ann