Well, car is back from Kwik Fit... and no charge for me as the recharge didnt make things cold again :(
I then started to search on here and started to fear for my wallet at reading the compressor stories, especially as my car is an 07 plate. However, upon parking the car up at home i noticed a hissing noise... opened the bonnet and there is a definite hissing noise from the lower left of the engine bay when standing in front of the car, so I'm hoping (read preying) that it might be a leak and not the compressor maybe? Or am I clutching at straws?
I didnt think to ask the muppets at Kwik Fit if the system was holding pressure or not, but i guess i could just as easily check that myself now.