I'm quite amused, because I now recall that 'drap' is French for 'sheet', not 'flag'. Still, flag is DRAPeau so I got more than half of it, which isn't bad given that I've had nothing to do with French for over half a century. Perhaps some particularly amorous knight...Sir BEDivere?... may have had a sheet as part of his escutcheon!
I've always tried to offer you assistance in the past, Gribble, and I'm glad you feel it was a genuine help to you. Sorry to have been so wildly out of kilter this time. Cheers