I'm currently selling a 2016 Peugeot 5008 with 66,000 miles on the clock on behalf of a friend. It's a one owner car with full history, no faults at all, with a year's MoT and four new tyres, and the car is in great condition. I have someone who is very interested but is concerned about paying so much for a car so wants me to provide a 'warranty' for him. He is asking for a 30-day warranty just to cover major problems, no service parts (brakes etc).

When I spoke to the owner of the car he says that he would happily write a 30-day warranty out for the new buyer's peace of mind because he guarantees it's fine.

My question is, being a private sale, would the 'warranty' actually mean anything? If there was, for example, a catastrophic engine failure within that 30-day period, would we be liable? Or would it be the new owner's responsibility? What rights would the buyer have against us?