You could also try meths after the saddle soap + drying, but if you're dying them after then I'd be inclined not to be too rough.
Cheers will have a go with the saddle soap, and have a look at Dylon (@withered_preacher it seems they do leather dyes as well as fabric)
@hugo7 started
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You could also try meths after the saddle soap + drying, but if you're dying them after then I'd be inclined not to be too rough.