When selling an old banger it is going to have faults. You just have to over yourself by stating them clearly in the advert and on the PDI / purchase invoice.
The customer signs and agrees the faults were present at the point of sale, they are then excluded from being covered by the CRA.
In all sales scenarios protect yourself, your business and the consumer. If they’re a pain on collection, they’ll be worse post sale. Don’t sell them the car, don’t sell yourself trouble.
There is nothing wrong with doing the above, but the car MUST still be roadworthy. If the car is unroadworthy it must be sold as unroadworthy and trailored away. Don’t compromise the above and never sell a car as “sold as seen”.
Buy some Lawgstics PDI and invoice pads. Good luck.