Hi Peter
Air China will be flying to both airports (from 2 May) for the foreseeable future, probably because there is a lot of demand for this route and they can't get as many slots as they would like at Heathrow.
We will continue to use their Heathrow flights in 2012 then move toward using the Gatwick service in 2013 - so there won't be any changes to China holidays departing any time soon.
Kind regards,
Olly, your editor