Hi.
Yes, 7mm Allen key.
Firstly remove the brake fluid lid and carefully wrap the canister with absorbant cloth round it so when you push the pistons in the fluid doesn't spill over and make a mess. Once jacked up safely and the wheel removed spray some release oil on the two wheel locating pins. Then with a big screwdriver wedge it between the back of the pad on the opposite side to the slave cylinder and lever it back, this pushes the piston in. Remove the holding spring. Remove the plastic bungs from the slides and undo the 7mm Allen bolts holding the caliper. Tie the caliper up so it's not held on the flexi pipe. The caliper holding bracket is held in with a star bolt (I think that's the correct name) remove the two bolts and carrier. Put the car in gear, (I only jack one side at a time) undo the wheel alignment pins, thy can shear on occasions but if this happens don't panic. Once removed the disc should come off, sometimes you may need to hit the back of the disc with a hammer or even a little heat at the centre near the hub but they will come off.
Refitting is a reversal of dismantling, clean the hub and mating faces with a wire brush and rag firstly. If the wheel holding pins sheared you can either drill them out and use a stud extractor or forget about them once the wheel is bolted up everything will be fine.
The spring holding the pads is fiddly to fit though.
Have fun.
