V/S 500' / Min seems to work quite well at LGW and LHR coming out of the hold or thereabouts. LGW always seems to be a few miles short of actuality if they offer you track miles to run. I think you can fly level for about 4 miles below 4000' and only need 100fpm down at any stage so it's not too onerous.Anyway, it gives the 'cruiser' in the bunk another few minutes sleep!