Married as George Robert H in 1906 using just Robert 1911
It looks to me as though the following may relate to this Robert (can't find Florence's death though):
20 May 1883: Robert Henry DENNESS (and twin George Frederick) born St Olave to John Thomas DENNESS (coffee house keeper) & Elizabeth Frances nee Adams, of 205 Bermondsey St. Both twins baptised at St John, Hoxton, as DENNES, on 17 June 1883. (George possibly died Jun qtr 1884 Shoreditch, aged 0, registered as George Frederick DENNESS).
Dec qtr 1921: Robert H DENNIS remarries to Maggie S M Clarke, St Olave
Dec qtr 1923: Son born - Robert S J DENNIS, mmn Clarke, St Olave
Jun qtr 1932: Maggie S M DENNIS dies aged 36, St Olave
Dec qtr 1934: Robert H DENNIS remarries to Sarah E Rouse, Bermondsey*
Sep qtr 1952: Robert H DENNIS dies aged 69, Bermondsey.
*This marriage registration is very close to Vera's marriage (adjacent page numbers).