After replacing the condenser and one of the pipes from the cabin down to the condenser which were leaking; the system now holds pressure (yay!) and was regassed only for a new problem to emerge!
With the a/c off the car runs absolutely fine and when the a/c was switched on the compressor kicked in. By dipping the throttle and letting off whilst in neutral the engine misfires and the internal and dash lights dim. The compressor also appears to kick on and off fairly quickly with intermittent cold then warmer air blowing out the vents.
The garage engineer had no idea what the issue was and said he was not happy to let the car go in the condition it was so all the refrigerant was dumped and I am still non-the-wiser without the ability to troubleshoot the issue myself. He also said that initially the compressor did not kick in at all once the gas was in until he gave the connector on top of the compressor a jiggle.
Thinking this could be some electrical issue but does anyone have any ideas what it could be that I can look into replacing before I take it into a specialist to have a look?