On the diesel spill topic, one day last year we approached the A47 / A1 roundabouts on the A47 travelling towards Peterborough. On the 2nd roundabout, there was no grip at all. If I had not been crawling along I would have come a cropper. The car in question was not a Morgan - I was in our Disco-3 with a large Rice trailer and our two horses on the back. SHMBO barely spotted the slide (the air goes blue if our horses get a rough ride!) but I was very lucky - the crawling pace had been dictated by a "moment" on the approach. The tyres on the car and trailer were both recent sets with good tread (Mud & Snow on the Disco). Things got worse until we passed an articulated lorry parked up on the verge. It was a refrigerated trailer and the fuel tank for the diesel powered chiller system had split. He had deposited about 30 gallons of diesel on the road.