Many Thanks Casalguidi
I had a look before there but like you say, they didn't seem to have Sussex on yet.
There is poss an entry for a William Terry Born Worth 1846 on IGI but its one that has been contributed, so no way of checking if its correct. Have not seen it anywhere else. There is also a Male Terry Born east Grinstead 1845 in the Index.
Also a William Terry Midhurst and a Lodsworth Terry.
I must admit I was quite surprised at how few William Terrys were born in Sussex or Surrey/Clapham/Wandsworth etc around 1845/6.
I may have a look on 1837online soon as I am trying to wait for a few look ups before spending more money on there!...

That is interesting re a Terry in Clapham aged 15. I think and there is also a Clapham in Sussex isn't there? (East Preston & petworth?)
I will have to see what I can pick up from the BC's and online and then make some visits when necessary.
Kind Regards
Paul