I just thought I'd post the solution to my problem here in case anyone else has probs with their electrics.
What the problem was with my fuses blowing and lights on the dash and instruments failing was due to a short in a wire behind the radio. There is a piece of metal behind there with a sharp edge on it and the wire loom was resting on it and so every time i went over a bump in the road etc it would rub against the sharp edge of this piece of metal eventually cutting through the wires. (poor design on Fords part I'd say)
Anyway my problem is solved now, good luck with yours.