I read several posts prior to doing my brakes and found some useful posts but none with photos. So here is my contribution with photos which someone may find useful.
Before you start ensure you have at least...
sockets: 12mm, 17mm and 19mm (no you dont need a 36mm socket as I originally thought!)
big flat screwdriver
claw hammer (or large grips)
string (or light rope) about 4 foot.
Take wheel off.
Replacing the pads -
1. using your big screwdriver on the caliper push the piston back into the cylinder (whilst still on the car).
2. remove the spring (see blue arrow on photo) with your pliers
3. remove the caliper and tie up out the way with your string
4. ensure the caliper will float (see green arrows on photo) it should move freely up and down the shafts, if not then you must free them off.
5. fit new pads and use a folded piece of cardboard to keep them in place.
6. Remove the retaining bolt (12mm bolt head) on the disc, then hit the old disc with your large hammer several times all around the edges and it will come off (no need for a puller as the old disc is scrap). It will eventually come off.
7. replace the disc and caliper
8. replace the spring (see blue arrow on photo) with a claw hammer - claw-end (or grips)
Easiest to do last as the spring is fiddly and quite strong.
Here is the finished job:
EDIT: note stage is not complete! Make you you complete it...
Hope that helps someone...