I genuinely would never sell a car if to my attention has a problem and that to from my home doorstep. The buyer clearly knew its my personal car that ive have been driving. With all my cars that i sell from my business premises we always stick on a 6 month warranty as standard with WMS for the customers peace of mind. Usually all over our cars we sell are well under 10 years old and under 100,000 miles. The issue with the BMW i sold was that first it was over 15 years old and had done 175,000 miles and there is no way WMS would let me stick a suitable warranty product on that car hence the reason why i sold it on an ebay auction and i made it very clear to the person buying it that there is no warranty whatsoever with this car and never provided any of my company paperwork to him.
The letter he sent me was via special delivery and he is using the sale of goods act 1979 instead of the consumer rights act 2015 which would generally be the case buying from a trader. He hasnt addressed it to anyone, just my home address as he doesnt know my company details.