Bled the rear calipers today...
 

And it actually went exactly according to plan! That's the first time I've ever done the job without it being a complete nightmare- delighted!

However, both pins are absolutely stuck... But looking at the thing, I wonder if that's actually going to be a problem. Just wondered if there's any flaws in my logic- the pins moving isn't important to the operation of the brakes, as long as they're clean and smooth- which they are. So is the only drawback the fact that I can't change the pads without splitting the calipers? I can deal with that I think...

You're right, the seized pins won't affect the braking performance. You can get them out when it's new pad time by drilling holes through the caliper into the backs of the blind holes, then you can get a drift in to knock them out.

Is it possible to get the top off the rear brake reservoir without removing the whole of the rear fairing. I replaced my pads at the weekend and could do with bleeding them too.

I know this is the case with the front calipers but my back caliper has the pins going straight through to the back already with R clips holding them in, it doesnt look like its been drilled but maybe the previous owner has already done this. The pins came straight out no probs.

I don't think you can get by without removing the fairing, perhaps you can just move the RHS one a bit but I doubt it to be honest. It's not a big deal to remove anyway, and it'll do those sticky phillips-headed bolts good to get removed and greased.

Cheers Johnnyrod, that's what I thought but I like to get a second opinion for important things like brakes. I'll not be changing the pads for the forseeable future anyway so I'm not too worried about chaning them.