Thank you everyone for your advice, much appreciated as ever!
I was getting very frustrated with the calliper removal. Unfortunately I had already removed the centre spindle & so the wheel was too loose to push/pull the pads & pistons against the disks. I think removing the pads is easier & I can give them a good clean & copper-slip the pins & back of the pads whilst they are out.
Front mudguard removal is a good idea as well
