As a DIY check, first ensure the slow speed works on the radiator fan. It's needed by the aircon system to cool the condenser. That's located in front of the engine radiator. The usual cause of poor aircon performance isn't lack of gas, it's loss of the slow speed cooling fan.
Running a diesel means engine cooling is rarely needed so the aircon performance is often the first sign that the fan has packed in. You can confirm this diagnosis by running the Demist test. This invokes aircon and the fan should start immediately at low speed (a relative term, it's actually quite fast). If the fan trips on after a few minutes and pulses on and off )at higher speed) then you need to fix the fan. Doing that depends on whether you have the older 3-speed or the later 2-speed system.
If you want to run this check and need more info, search for 'Demist Test' or come back here.
TC
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