I basically followed guidance from the thread and youtube.
1) Remove existing wax finish using cotton wool balls and 100% pure acetone. (Well ventilated area - Dont gas yourself!!!)
2) Mix some Feibings Professional Oil Dye into a quantity of Lexol conditioner in an old yogurt pot. (I used Dark Chocolate brown for the first lot, then medium brown? for the C&J)
3) Paint the dye/Lexol solution over the shoe, leave to dry
4) Repeat above until it's not patchy.
For the patina, I basically started with a dillute dye in Lexol solution and painted a large area, then added a bit more dye and did the next level of detail, etc.
I wouldn't recomend painting neat dye straight onto the leather as it soaks in relly quickly and is difficult to get a good finish.
EDIT: When you are painting leather dye, make sure you give yourself lots of room and cover your worktops. Make sure you do NOT paint dye onto your wife's favourite white candlestick thingy.