First thing I did was find someone to stand on the brake pedal while I looked at the wheel - nothing dripped or ran out.

Next I checked the reservoir in the engine bay - levels looked good, the same as when I checked on Sunday.

Cleaned up the pool in the wheel then started the moter and pumped the brakes, a little soft on first push then hard - normal, and no fluid leak.

I got the car home ok and have parked her up with the old leak mark at the top of the wheel. Will check in the morning if it's leaked again and will strip the corner down and check it all through.