To those who either ignore, or dismiss, the EGLL hub argument (or reason for an extra runway there), I would just like to say that those of us in the Channel Islands would absolutely love to see an extra runway there, & the re-introduction of services from the C.I. to Heathrow.
Gatwick just doesn't have the connecting flights to most of the long distance destinations e.g. the whole of the Far East, SE Asia, India & Pakistan etc., Australia, NZ, South America, the whole of Africa, the Middle East, Canada, USA, Caribbean or Central America.
&, before you say "Emirates", all of their connecting flights operate via Dubai, whereas you can go to all of these destinations on the same a/c from EGLL.
ALL that involves is a coach journey to Heathrow to/from Gatwick both before & after your long distance flight ! What an absolute pleasure that is !!!
An extra runway at Gatwick would do nothing for us; & nor would it solve the hub requirement problem at Heathrow.