Just changed the valve solenoid block. £52 it was. Hardest part was jacking up and removing the wheel really. It is behind the front left wheelarch liner, the liner is in two parts, it is behind the rearmost half, sort of behind the repeater signal on the wing. 5 torx screws and it can be peeled back and access is easy without removing it.
It was not leaking around any connections, replaced and cleaned it all and tested again for leaks. Charged the system. Suspect no different but will need to drive and park up to level the vehicle properly. If no differen't hopefully can sell my old valve block as it must be OK.
Attachment 21276
Attachment 21277