Jim many thanks for responding so promptly and comprehensively. The road tires are X1EX2E310 . 245/4 5R18 100 W tubeless. There is no mention on the tires of the letters RSC.
there is a compressor kit , but no Jack Choc or wheel brace. Much to my embarrassment I should’ve looked at this when purchasing the car.
The spare which I’ve bought today says it can only go to 50 miles an hour it is a Pirelli 135/80R18 104m. The wheel (not the tire ) measures approximately 19 1/2 inches, almost the size of the other wheels and the stud pattern appears to be the same.
on balance I’d like to have a space saver wheel that fits the boot and gives me peace of mind.
any further comments when you have a moment would be gratefully received.
thanks and regards.
Malcolm.