In fact Gainsborough Heritage are based in the old Post Office buildings, which happen to be on the corner of Spital Terrace and straight opposite the Methodist Church built in the 1960's( possibly slightly earlier). My grandad worked as a foreman during the church construction.
In the discussion board of the Gainsborough group there is a thread "who was Fanny Craven", the question coming about due to the Fanny Craven Hall situated on Spital Terrace and featured in both old and recent images within the group. The answers largely came about as a result of a census request i posted here on Roots and a good nose around the 1930 Kelly's.
It's a shame there aren't more groups within Flickr like the Gainsborough group, many a family/local history query comes up within the group and some people photos have had names given to what had been unknown faces.