Thanks for the advice Guys.
The day went badly.
Jacked up and removed the wheel, couldn't get a socket to fit the caliper mounting bolt - a quick google tells me its a 12 point 13mm socket, my socket set (which i bought 20 years ago) has 6 sided sockets. A quick trip into town sourced a 13mm socket of the correct type.
Caliper removed, centre nut and associated gubbins removed all OK.
When tried to remove the disc from the hub assembly I was stuck for a socket again - 14mm this time, a quick call to the wife to procure a new one (she was in town anyway), a call back from the wife to say the local, hardware shop was clean out of 14mm sockets but they did have a set of 12 point sockets for £18 - OK buy them and I'll get the job done.
The wife appears 20 minutes later stating she had left her purse at home and will need to return to town to buy the sockets - in the meantime I had looked to the caliper to back off the pistons - all 4 seized pretty good - one of them had the remains of a seal which flaked off when prodded.
As we speak the LR is sitting upon a jack awaiting me to buy some new calipers (the new socket seems superfluous at this point)
A quick order to Paddocks should source a couple of front calipers to see the job done properly.
The backs could be another story altogether.
Cheers
Graham