I'm busy on the forum today
@Pudding mentioned that my AC issue could be due to the pressure sensor - so just been out to have more of a look. Live data was cycling 0-1-2 bar, so wondered if it might be a dodgy connection. Managed to pull the connector off - and there was a slight hissing and the connector was wet with oil. So, seems to be a dodgy sensor, maybe electrically and physically. Is that common?
EDITED to clarify - the electrical connection to the sensor caused the hissing, and itself was holding pressure
Interestingly, plugged it back in, and retested it, and it claimed that the pressure was basically maxed out at 38bar and kicked the radiator fans in. This sorted after 30 or 40 seconds though. Now reading a teeny bit higher - 1-2-3 bar and occasionally kicking in the AC for a few seconds. So looks like everything else is good - just a new sensor and regas should do it.