Arrrgh! Just booking them as the price went up, extra £200! Gutted
https://www.google.com/flights/#flt=/m/04jpl.LAX.2018-09-19*LAX./m/04jpl.2018-09-26;c:GBP;e:1;sd:1;t:f very quick search. its the going rate if you book more than a month out. probably not during the school holidays though :)
I've just got back from LA, and there were no flights anywhere near that price, both from Manchester or London
If you're in manchester I'd agree, but there are plenty of folks in the midlands for whom getting to either airport on public transport is a bit of a mission..
with the train fairs (return £260, although from £12 to london plus the heathrow express fee) and unreliability off getting trains from up north, then a hotel and or extra time added to ensure you get the flight and home then this is a good deal..