Well it did not need a new caliper

In the last 10mins it has passed

the new caliper helped a
little (sod all difference to be honest) plus giving it a long test drive and really warming the pads up.
God only knows what it is going to cost, as a goodwill gesture he has given me a free mot and the old caliper back to resell.
So just the labour bill to sort in the morning.
Wish me luck.