I have ordered a Savage rear fog light switch which lights up when turned on. Is this sufficiant or do I need another warning light?

The only other warning light I have ordered is for the hand-brake - any others?

That's enough. My rear fog light has a tiny 2mm LED and it was deemed sufficient as a warning light.

Apart from the usual main beam, hazards, indicators etc?

You need a light to show when the indicator lamps are active (ie hazards). you don't IIRC need separate lights for the L and R indicators- but you can have that if you so desire!!

You'll also need a light to show when your headlights are undipped (ie main beam).

Cheers guys I now have savage switches for:

Lights - side
Lights - main
Lights - dipped
Horn
Hazards
Fog
Start

And a handbrake warning light and indicator toggle switch

I am using the bike clocks which have indicator lights, etc

So I think that all the bases covered?