Thanks Guys
Maybe 250 "as soon as you can" is a better way of putting it - the mach/speed transition is very variable dependent on type.
With regards to delay ... theres another conundrum - this was due LGW delays - the next controller gave us direct MAY and LGW a base leg for 26L - hey I know its dynamic, but there you go!
I was surprised, I have been operating into LGW for nearly 30 years and it was the first time I have be "rebuked". The 787 is a very different beast and Im not sure that ATC have got their collective head(s) around the way it works.
Bring back the jumpseat rides .....