Eeek!
Wonder if that guy got a TCAS climb too!!!
Thorpe is OK - but you will probably get not above 800' - depending on LHR runway config and the wind.
Not so bad if Departing 27R with a 30 knot Westerly wind! Given that the ground is up to 150-200 ft there it must be a bit hairy! Also absolutely NO room for error IF you go wrong!!!!!!!
(I am thinking paperwork in my break again....!!)
Cheers
WC - which a/c do you fly out of BIG?