Oh well, back to square one. Finally got contact from the Tyremen who said they'd cancelled the order because they ran out of tyres, but might be able to source some others, but they weren't sure. Just told them to leave it for now. Will have to try the second hand wheel route and see if I can get tyres from somewhere else. Brilliant.
but might attract all the snow to attach to my car instead of driving over it 

......so decided to turn round and work from home today