Would recommend all owners of the 620 engine have the drive belts to the Supercharger checked every 10,000 miles. My car has done 12,000 and the belt has disintegrated in 5 places. This wasn't picked up during the 10,000 mile service at Caterham. I am driving from Milton Keynes to Scotland in the car on Thursday so it was fortunate that this got picked up before I headed out. Have Dave at Days Garage, Milton Keynes to thank for this.