Hello Again ..... I am back..... I checked all the parish records on FindMyPast for David born 1840 . Not a lot but enough to help --possibly. interestingly it also had Census information included in the 1,700 odd matches.
1851 Census Mum Dad and 3 boys last is David age 11. and birth place matches. this is the only one that makes any sense.
Then in 1871 there was an entry for David and Sarah as found earlier for Dorset. However this is not our couple. Sarah is from Dorset not Uffley as earlier noted. This was another bit that added to the confusion.
I need to check Sara's maiden name and if that is not manning then we know that the second David is from another Gilbert family.

Thanks everyone for all the helpand interest again .
Essnell