Flashing glowplug light, loss of power, eps light on limp mode etc...

Apologies if this is a repeat post which im sure this issue maybe..but im on a mobile and cant really do thorough searches on forums on a mobile phone at 3:30 am on the side of a dual carriageway!

cutting most of this short ive been told by an AA tow driver that it maybe a brake light switch.
Can a simple switch really cause all this ****?? :

Loss of power
Glow plug flashing light
Limp Mode/no acceleration
ESP light
brake lights permanently on ??

I thought my turbo had gone initially...but nothing is smoking out the back.
, none of the tail lights or healights are dimming so i dont think it would be the alternator. I will obv have it run through a diagnostics later on this morning by AA first off to find out what it is bringing up code wise if anything... but *** if it turns out to be brake light switch why can't audi spend more of their money on making sure simple things dont break and cause electrical chaos!

Im hoping it is that and not some failing ECU problem etc

I love audi but i also hate them.

Well it was towed to a garage and the core read came up with about 9 codes lol, all sorts of rubbish. Brake light switch being one and it looks like may possibly be an ECU error or just electrical short somewhere. boo

just an update for any future readers. Garage called this morning to say that the electrics had shorted out due to a wiring harness being melted. Melted by.. i think he said the turbo pipe of somesort and had shorted out against the pipe after melting through the wire housing. Handy...

I am quite crap at names for most things as a learner on car parts under the bonnet lol so ill post a pic up later if thats indeed all it was to show the offending pipe!