A lady brought in a piece of Harry Wingfield artwork on a recent edition of Floggit! The picture was from 'Going to School' and featured Ethel, Wingfield's wife. The piece was valued at between £600 and £800 - much nearer the mark, I think, than the valuation on Antiques Roadshow, a few weeks earler. You should be able to see the episode here for a little longer. The Wingfield bit is quite near the start.
The owner had no intention of selling her artwork. Very proper too.