In the UK, I'm not far from LGW. But I fly EVA LHR-(BKK)-TPE-SGN. Flying VNA LGW-SGN seems like cheating so I haven't done it yet. It would all be over too quickly.
It would be great if more Asian carriers could fly from Gatwick. In fact, EVA started with Gatwick until they could get the slots at Heathrow.