After noticing that the air-con was not as effective during the recent warm weather, I decided to have it regassed at a friends garage. I always use the air-con for demisting during the winter and bad weather, as well as when it it warm. Sometimes I have not used it for periods of time. I have own the car since September 2015 so this is will be it's first regas in a long time.
I drove to the garage with the system running to get a comparison, and it barely effective when it was switched on.