Cheers guys, just had another look at the deal and it says ....
'An Network Tyres mechanic breathes new life into air-conditioning units with a service and re-gas. After a thorough inspection, any pesky leaks are identified in a pressure test. The job comes to a close as the mechanic re-lubricates the system with fresh oil and recharges it with refrigerant.'
Just wondered what the re-lube is about?
I'll get it booked in anyhow I think.