Thanks, I'll give them a ring - their website suggests Michelin XAS (but only 15 inch is available), and Pirelli Cinturato CA67, which are £430 - which seems a bit strong. But if it keeps me out of the ditch, then it could be money well spent. Many thanks.

Dave
Blue 4/4 1969, Green +4 1953, (different) Green +8 1977