Originally Posted by
KARFA
Previously A7 and A8 used to be configurable between international and domestic arrival gates. Unfortunately it was decided a few years ago to stop that and these two are only for international arrivals. So with more domestic flights we have fewer domestic arrival gates.
Thanks BA

Were those the 'swing gates' with a door that required HAL to be present to stop people from wandering through the corridor and ending in the Domestic arrivals route? If so I think the closure was a mixture between HAL not being bothered to do that anymore and a few instances of international passengers slipping under the beady eye of the HAL guardian and into Domestic arrivals...
All in all, there is so much scope to make the arrival/transfer experience at LHR better... But I better not get on that soapbox.