Hi Jenny
The Surrey Burial Index definitely has a Henry Roberts buried in Leatherhead in 1841, aged 37. Unfortunately it only gives the year, not the actual date.
Found then in 1841 census:
HO107/1070/12 page 26
Leatherhead Common
Henry Roberts, 37, Bricklayer
Martha, 36
Ann, 15
George, 15
John, 13
Martha, 11
Elizabeth, 8
Caroline, 5
Henry, 1
Also living with them were :
John Roberts, 70, Bricklayer
Ann Roberts, 80
Assume these were Henry's parents?
NB there was a John Roberts buried in Leatherhead in 1843, aged 75 (bear in mind that ages were supposedly rounded down in the 1841 census to the nearest multiple of 5 years, so John could have been anywhere between 70 and 74.). No entry for Ann.
As regards Ayres I found the following:
William, 45
William, 15
David, 5
and living elsewhere in Leatherhead:
Charles, 15
Also found Hannah Ayres buried in Leatherhead on 16th Feb 1840, aged 40.
This doesn't tie in with William born 1777 in Oxfordshire as it is stated "born in county (ie Surrey), and indicates a d.o.b of around 1791-1796, but some of the children and their ages do fit in.
Anyway, hope this helps!!
Best wishes
Stuart