I just received an email from the AC stating due to airport regulations at the following locations; LHR, LGW, CDG, you can only use the AC on days that you have a boarding pass.

For some reason the cut and paste for the email didn't work but I'll forward a copy if anyone would like one.

It's worth a try on arrivals and I'll let you know how it goes at LHR on Oct 21.

DR