Toby, nice kicks. There's a LOT of life left in those.
What I would do:
1. Get a new heel put on - if you're up for spending money, get a dovetail heel, otherwise a standard heel is fine.
2. Brush the whole shoe with a coarse horsehair brush for a few minutes.
3. Wipe it down with a damp cloth and leave to dry for a few minutes.
4. Take a standard brush and buff till your arms give out.
5. Apply a thin coat of Saphir Renovateur or the Ventian Creme stuff and work it into the leather using your fingertips or a cloth
6. Buff with a standard brush till your arms give out.
7. Take a stocking from your girlfriend and stretch it taut over your head and rub your dick furiously over the toe of the shoe.
8. Post pictures + accept people's compliments.
^^ not sure how everyone missed fxh's slightly edited quote^^^
Just don't try this with stingray...