Can anyone with fashion knowledge hazard a guess at the wedding photo's date? That would make it easier to work out the ages of the people in it, and therefore who they might be.
I already hazarded a guess - 1900ish i.e. definitely between 1890 and 1910 (my initial reaction was 1905 based on the late Victorian, early Edwardian costume), perhaps as long as 20 years
after the old lady had her photo taken. I would be astounded if the Mercy picture is of anyone in the wedding photo.
H Harbut was active in Newbury in 1872-88 (Northcroft Lane) and 1889-1895 (West Mills). The only reference I can find of him in Bartholomew St is at 117-8 (Coles Studio) in 1881. This is a pencilled addendum to the 'Directory of Newbury Photographers' by Paul Cannon. Thomas Cole was a shopkeeper (115-118 Bartholomew St) who, presumably, let a room that Harbut used for a while.
Sally - 143 Bartholomew St is a new reference - any chance of a scan of the back of the photo? This can be very useful in dating a carte de visite (which I am assumming this is).