Leathertique has a complete line of cleaners, reconditioners, dyes, etc. Have used it on an MG TD and it did bring back some of the softness? Not sure if the dye is more a paint... have seen demos at car shows but not sure about the dye part. Any good leather supply store should have a complete line of Fiebings.
One thing to test... take a drop of water and put it on a corner of your leather...if it 'beads', nothing on the market will penetrate (its a lacquer based dye)... if it does penetrate, you can choose anything out there! German leather tend to be lacquer (bmw's anyway)... not sure about British! My leather had so many cracks it had to penetrate!!!!
http://www.leatherique.com/
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gblawson

Mobius strip no-wear belt drive! (Please see other side for warranty details)