Rural Airport
It was a amply long "international" airport where we operate regularly... and an uneventful diversion.
The question though is whether there is a LEGAL duty under the rule not to overfly London... LHR on 27L ... I don't want to criticise the trainer, simply to explore the issue that he clearly thought my company would be very upset with me for diverting, while I think to carry on would leave me open to prosecution.