Thanks for the reality check guys...can't beat a bit of local knowledge.
145 QRH - I think you were with BRAL once upon a time.It appears my figures may be a bit rosey (although the UK pound won't be making much headway from its current position for a few years yet). I will rework after lunch.
You are incorrect to assume I have made the decision...I have several iorns in the fire and am doing some bottom trawlling to get the full story before commiting time and energy to assessments.