Year: 84 B plate
Description of problem (please be as in depth as possible):
Hi folks, as you can probably tell from my early posts I'm just getting my head around my new mini - just need a bit of advice on my internal dash switches and a few things I've noticed... Apologies if this is all a bit basic to most! Here's a pic of my internal switches...

I'll break it down with my questions. First of all, left to right it goes: Choke, Brake lights test, rear windscreen demister, hazards, lights and heater temperature.
so....
Is it possible to lock the choke out? When I pull it out and twist to lock it it just bounces back flush - fine now when I only need it to start the car, but could be problematic in the winter!
Hazards don't work but this could be the switch or the relay? Interior light & indicators work so presume it's one of the two?
The lights are on a three stage switch - the middle stage doesn't seem to do anything - should it? Third stage puts all lights on as expected.
The heater temperature pull, presume that the further out you pull it the hotter it gets?
Additionally, I have these switches on the right had side of the dash:

The middle one is my fog light, but I have no idea what the one on the right does - it looks like an aftermarket switch - there's some wires that travel from it under the dash but then disappear - long shot I know, but any idea on what it might be??