I wonder whether the original poster has a similar procedure to us ?
Some time ago, we adopted standardised emergency turns off every runway. If terrain is a factor, it is taken into account, if not, at around 1500' AAL, we turn back into the overhead and hold.
Slight snag is no one has ever communicated this to ATC units and when I have discussed it with ATC colleagues the reaction varies quite a lot.
The rational is that you stay within a terrain surveyed area although it would probably be a shock at LGW or MAN if you did it during a busy period
