I've posted this in the thread I started in the 1 series section, however since I also had several posts in this thread I thought I'd post the following result below!!!
After diagnosing that there was power getting to the fan motor I stripped off most of the passenger dashboard.
Then my dad spent a couple of minutes having a poke round, took the final stage resistor off, put his fingers into the fan and spun with his fingers. The blade was stuck for some reason... My dad just pushing it free was enough to get it blowing again.
So frustrating, as I needn't have taken the glove box etc off!
However the above only took 1 1/2 hours start to finish, and I'm just made up that the problem is solved.