* more days when it would be fog bound
* interfere's with existing flight paths for AMS and BRU
* wrong side of London for most people
* ship full of high explosive not too far away
* higher likelihood of bird strikes as it's in the middle of area that's key for migratory birds
If Heathrow was to move somewhere along the M40 corridor is probably the best bet (and attach it to HS2)
