That's perf data for the standard GE engines. Flybe have chosen the uprated versions for this very reason.
Wycombe, You are quite right about the cul-de-sac parking arrangement - since BAA changed stands 8-10 for 5 nose in stands (meaning that higher tail fins protrude into the critical area) the only appropriate stands are those left round the corner, ie stands 2-5 which is enough if they replace each of the 4-based 146's for a new embraer. But hey, lookin at the airport plans those new remote stands should be built within a few years.
T