Funny you should mention that...
Whilst 'IIP was on holiday in the Azores I operated a LGW-ATL with a fairly light pax load. We had a last minute request for 30 extra meals as we were being given pax from the MCO. This was because a LHR based 777 in three class config had been substituted and there were now too few seats. Other pax were sent to LHR and traveled via MIA.
The high density routes from LGW are ANU (my next trip) KIN,MCO,TPA,BGI. The daily ANU operates alternate shuttles to TAB,UVF & GND.