Hi Ian55,
I found the following information this afternoon and you can check it for yourself on FamilySearch.org:
A William Constable married Jane Woodward in St Bride’s Fleet Street on 6 September 1795. It’s too much of a coincidence (Betsy Woodward Hants) not to be right, isn’t it?
And IGI (Familysearch) gives a birth date of 17 June 1798 for Ann Constable, christened 11 July 1798 at St Luke, Old Street, Finsbury, London; Father William Constable; Mother Jane (no surname given).
There was a Janney Woodward christened on 29 Sept 1771 at St Mary’s, Portsea, Hampshire
As for William Constable's career in London I'm afraid I know nothing yet. George Constable marked his work sometimes for Dundee and sometimes with just his GC.C stamp clumsily and several times. This mark is also found on pieces sent to Edinburgh for assay (neatly struck!).
Their mother was Ann Thomson and one of the silver sites (
http://www.silvercollection.it/SCOTTISHSILVERSMITHSCUPAR.html) lists a Robert Thomson as a silversmith (of whom I know nothing). Perhaps this family connection is the route into silversmithing for the brothers Constable.
As you probably know, William's son Alexander took over the business on his father's death in 1833, but I know of no connection of him to Kirkcaldy. Is the Alexander Constable you refer to related?
William's son Alexander disappears sometime after 1841 and intended to travel to California but I have found no further trace so far.
I'd be very grateful for any information you might have on George Constable, or on William's son William, a writer (clerk) in Edinburgh, who would have been the next in line to inherit after Janet Constable (Bruce's) death. Unless Alexander came back from California!
Or anything you might know about William in London. I'll let you know what I discover, if anything.
Good luck with your research!
inarcadia