I think I'll do that. I've got the 17" Monzas anyway, and as I'd ask the garage to do the change whether it was wheels or tyres, it's probably the simplest option.
I wish I'd done it three months ago. If only I'd known....
If I do it next winter, it'll probably be 2006-07 all over again! (Except that's the winter the Pug spun off the road on black ice, so it's still a thought.)
Rolfe.