You mentioned a Joseph TOMBS in Castlemorton in the 1851 and 1861.
This perhaps the same chap as the following in the 1881 in Castlemorton:
Joseph TOMBS, 60, Ag Lab, b Castlemorton
Eliza TOMBS, 30, Wife, Glover, b Hereford
Emma TOMBS, 7, Daur, b Castlemorton
Charles TOMBS, 4, Son, b Castlemorton
Their marriage perhaps the one of a Joseph TOMBS (also indexed as THOMBS) in 1870 in Upton on Severn, an Eliza COOPER on the same page.
Not that this helps.
JAP