2005 Cooper S, 105K miles. Cooling system sorted; 60 miles later, it's just started making a noise like two skeletons making love on a corrugated iron roof... It sounds like a b****y diesel... It's from the top end, and I don't know whether it's the tensioner or the plastic fixed chain guide, but it makes sense to fit a complete kit at that mileage. Does anybody have a manufacturer's kit to recommend, or indeed a manufacturer best avoided?