[844PHW]

I can take this tyre business a little further. Michelin insist that the tyre is available in the required size. The Volvo dealers say that they can supply the tyre in sets of 4, but not individually. Most tyre outlets do not stock the tyre. One dealer that I have found does list it, and specifically mentions it is intended for Volvo (i.e. it is homologated). So it seems to be a case of potentially difficult to obtain rather than not available. That was a couple of hours investigation that should not have been necessary.