Going back to your marriage registered in Sep 1849 Reading 6/339 -
As you know marriage was at Reading Register Office
Benjamin Holley + Sarah Tims (local ref RG/3/129)
also on same page, 339, and of course married at same place
William Holley + Mary Ann Gearing (local ref RG/3/128, so the marriage before Benjamin in the register)
I think Martha may be the daughter of William + Mary Ann Holley and is with her Gearing grandparents in 1861, transcribed Halley (RG9 piece 739 folio 10 page 13)- they also have a daughter Martha.
So the birth registrations in Wokingham, some are Williams children and Harriett Elizabeth is daughter of Benjamin?
Looked up the baps in St Mary Reading -
7 Jany 1855 John Benjamin, parents Benjamin + Mary Ann Holley, abode Coley Street, occupation Baker, perf by
S W Yates, Vicar
2 August 1857 Mary Ann, parents Benjamin + Louisa Holly, abode Coley Place, occupation Bricklayer, perf by S W Yates, Vicar
1 April 1860 Harriett Elizabeth, parents Benjamin + Mary Ann Holley, abode Hazel Court, occupation Baker, perf by H C Calverley, Curate
5 January 1862 Ellen, parents Benjamin + Mary Ann Holly, abode Leopold Road St Giles's Parish, occupation Labourer, perf by George Frederic Noad D.C.L. Officiating Minister
1 May 1864 James, parents Benjamin + Mary Ann Holly, abode Hazel Court, occupation Labourer, perf by Wm Jeth Few?, Curate