I have just bought a r53 cooper s 52 plate , I have driven it home and done a couple trips in it less than 450 miles since buying it privately he made me sign a sold as seen , however , I asked the seller multiple times does it have any head gasket issues , both him and his wife both said no I have documented this , the coolant is brown milky it has slight hesitation in first snd second half throttle , the paperwork he gave showed supercharger service , and multiple coolant flushes and a radiator flush 2 years ago , I didnt check the coolant stupidly as he told me there was no issues , theres no mayo under the cap or on the dip stick , could be oil cooler as it hasnt over heated and the needle has never gone a touch over dead centre, and the only smoke is from cold start a slight greying smoke for about 10 seconds or so and none when revved , how would you go about this , is it grounds for misrepresentation as I asked a direct question multiple times, has it been masked by the multiple coolant flushes , advice would be appreciated got a sniff test coming tuesday/Wednesday to do a quick test myself