No brake lights!

Right, I'm stuck guys, really need to sort this out so I can use her over the winter!

I've checked the fuse, at it looks good. I've swopped to a new brake light switch, installing it as instructed by the instructions. I've visually checked the bulbs, and they seem fine, but I'm discounting the bulbs, as the likelyhood of both the brake lights and the complete high level one all blown is highly unlikely, but not impossible. lol

Anything else that would prevent my brake lights from working? Best way to test the circuit?

Help!

So an update on this, I purchased a second brake switch to swap over, now the brake lights just stay on, no matter which brake switch I plug in! The only way to switch them off is to unplug the switch!
Could it be a faulty relay? If so, anyone got any ideas which one? Lol
I also used VCDS to check the switch, but it's showing nothing, not even the function of the switch! But the lights coming on means the circuit works!