Deep breath...here we go.
The instrument cluster on my GT (56 plate) went dark, the car still ran but no lights: fuel, rev, speed etc. Changed the fuse and it worked for a day and then started to flicker on and off. Now, when starting the car, it comes on and then goes off, takes two or three attempts for it to stay on and then it's all fine, I drive away without any issues. Once, though, not only was the instrument cluster 'off' but the break lights, indicators, wipers were all dead too...yet the car still ticked over and worked. Now and again it throws up the obligitory warning lights, immobilizer, mcsf, abs etc.
Like I said, once the lights are on the car is fine, no isuues, it just takes a few attempts for the lights to stay on.