I too had this problem, after investigation turned out to be leaking connectors to the heater matrix - mega job to replace. I tried adding Bars Leaks - 6 months later still no leaks!

Rob Wells Rob, many thanks for possible contact to do o ring change, Im in milton keynes, see your in staffs, guess too far peter lloyd

Water leaking into front o/s footweel Non r.r. garage diagnosed leaking o rings, and would not attempt to replace them. Suggested a r.r dealer would take about 24 hours labour to do this. Doom & gloom. Any shortcuts before i put a match to this rubbish motor. Thanks peter lloyd

Wills Slackened off mounting nuts - brilliant - thank you Peter lloyd

Have recently had new eas compressor and mounting bushes fitted. I now have loud resonance inside the car when compressor running. r.r. dealer says this is normal - I dont think so. Any ideas.