I have a set of the 20a's. Ubber soft. Not really given them a good go, but gave too much grip on my old Scaley 'jelly mould' P4.
I will have a selection of WASP tyres at this weekends swapmeet in Orpington. I'll be on the stage. Not singing and dancing though. Well..if I have a good day I might. You have been warned.