Hi, sorry I've not given any more details. I know I've already said this and I'm sorry if you think I'm going on but I'm just overwhelmed and flattered at all the support I've received with this and how much research everyone's been doing. So thank you!!
Anyway, I've attached a photograph of the marriage certificate. The witnesses are Catherine Head and John William Wells. I did search them but only found that John William Wells was another lodger in the area and later owned his own lodging house so I assume they were just friends...?
Re death certificate, a cousin does have a copy and I've emailed her asking for it so hopefully I can tell you more soon.
Just a note, on the marriage record, their ages don't really seem to add up, Henry is supposedly 33 and Rebecca is 32. However, through the same cousin, I know Rebecca was born 13 Nov 1850 so would have been 33.