Jaguar Classics XJS-C Convertible Series111 - Tyres - scotweiler

Owners Manuall (and fitted to vehicle) show tyre size as 235/60 VR15. Despite contacting Pirelli and other manufacturers no tyres of this size are available in UK, indeed many have told me I'm wrong suggesting that 225's are what should be fitted. I only need fronts (for imminent MOT) can I use 225's or any ideas where I can find what I think is the right version?

Jaguar Classics XJS-C Convertible Series111 - Tyres - injection doc

215/70/15 i seem to remember is one alternative. there was a guy on another forum who recently bought a set of 235/60/15's but it doesn't say where he bought the set.