The shops in this row, 42 to 46 Market Place, are the earliest commercial buildings remaining in the town and appear on a town map of 1634.
I've been over the border into North East Derbyshire today with a friend, and most, if not all, of the towns and villages there have created their own town trail with printed Blue Plaque Guide.
The guides give a history of the town with photographs and details of historical buildings and the trail takes you to each blue plaque.
I think it is something we should adopt in South Yorkshire!