Drove it to work for the first time in 2.5 weeks as I've finally got the brakes fixed. Managed to fix my rear caliper, had to get right down to fixing the caliper placing individual ball bearings and springs back in. Caliper was back on the car on Tuesday night, brakes bled last night, today all sorted.
Now have to return the replacement caliper that I bought off ebay because it just doesn't work. Having seen the inside of one, I can't work out how it's broken, but it certainly seems to be. Will be nice to have fixed the problem for £8.50 rather than £75!