I've used Autoglym and Lord Sheraton Leather Balsam....the latter smells lovely and the LLB would love it I'm sure

Mike Duncan recommended Renapur..well I think he did, the huge pile of old Autocar magazines Ben gave me had a load of Renapur brochures on top!
My last g/f who was very keen on horses suggested I used some saddle/tack dressing. Ko-Cho-Line. Don't use it on your seats! Not unless you want to soften your backside as well and stain your clothes! It was great however on the bonnet strap, keeping it waterproof as well.
Probably why she was my
last g/f !