So, thanks for help so far guys here’s a quick update - went to another garage who filled ac system with gas, apparently it wasn’t full. A/c still doesn’t work, pulley wheel with belt is rotating, clutch plate is free and turns by hand but doesn’t engage when ac selected. Guessing replace compressor.

When they connected computer to car it gave no fault for rear camera circuit although it did say steering angle sensor fault , when in reverse I get GPS map where camera image should be plus reverse parking tone from sensors.