Okay. Ready? (I'm a bit worried that I'm drifting off topic here, sorry if so - perhaps I ought to close this thread after this reply??).
Thanks for your searches, Newf. I picked up from what you'd done and looked at Edward and Harriet Lenton through the censuses. Easy to find right up to 1901 - consistent with ages and place of birth.
In 1911, I searched the name index for an Edward Lenton with Harriett - only one comes up in Fulham - age 68 as expected. Harriett Lenton with Edward - two come up, but one is in Fulham, so they look like our people. BUT her age is 65.
So I checked FreeBMD for a death and yes, a Harriett Lenton died in Fulham March 1919 aged 72, which would put her DOB at 1846/47. Check for the birth and there's Harriett Riches Dec 1846 Marylebone v1 177.
I found her in 1851:
24 Exeter St, Marylebone
Henry Richies H 77 Gardener b. Norwich, Norfolk
Sarah Wf 46 b. Marylebone
Sarah dau 7 b. Marylebone
Harriet dau 4 b. Marylebone
HO107/1490/394/24
Thought I'd try FreeBMD for the marriage and this came up:
Mar 1840 Marylebone v1 165
Henry Riches - lots of others on page but among them Sarah Marrian Hilton. Can't check whether it's a mistranscription, because the image is a typed one.
Only two characters away from the elusive Hatton - or am I just seeing what I want to see???