I recently changed from a BMW 530D, for which I had a set of alloys with cold weather tyres, to a Jaguar XF 2.2D and need a suitable set of wheels and cold weather tyres. The XF came on 245/40 R19s (it was a showroom model I purchased already fitted with 19-inch wheels or I would have opted for 18s). My Northampton Jaguar dealer recently quoted in excess of £2500 for a set of alloys with winter tyres, which is far too costly in my opinion. I would appreciate your advice of where best to source a set of say 18-inch alloys (is that a better size?) with your recommended type/make of winter tyres. If I change to 18-inch alloys, what profile tyres do I need to retain the original circumference size?