For those wanting to know
@r5gtt @Peskyjones.
I had my aircon gassed today.
Total volume required = 525g
Amount in car = 310g
So they topped up with 215g but no sign of any cold air leading me to believe it is in fact the G65 sensor.
Considering this might be an inline sensor I didn't want to risk losing the gas so I had him remove the entire contents of it, I'll then either fit a G65 myself or have VW do it this Friday along with my service.
If anyone has fitted a G65 before and has a general how to, that would be very helpful!