Quote from Raymond Dome:
"We did have an "Optimised V2" procedure ("Improved Climb" to Boeing pilots) which IIRC gave an RTOW of about 44500kgs, but there were restrictions on its use, although I don't remember what these were. Anybody?"
Never did it on the 1-11 but bans would have included wet or contaminated runways, perhaps? And maybe reduced thrust (assumed temperature method on the 1-11), although the latter's use with optimised V2 is everyday practice on big jets these days to minimise the required thrust.
But was the Luton runway long enough to increase the take-off run for a higher V2, or was runway length more limiting than WAT?