Hi Pete,I used Leather Repair Paint from Furniture Care off the Bay mate.it was a while ago and I've just noticed a bit of wear but I've got loads of paint left,it goes a long way.
Has anyone used these? https://www.colourlock.com I met them at Classic Car Show and have spoken to them on the phone to get my sons car done. They say that if you send a swab or even visit there office they can provide a full kit to treat 4 seats with perfect colour match for around £130.
Tricky.