I would take Gatwick over Heathrow every time, even if the cost was the same; with a GBP1000 saving it would be a complete no brainer

In my experience , the 777 services leave from close to the lounge ; the suites on the 777 are the same as on the A380 and with only 8 people max in the 777 , I find the 777 preferable to the A380