I think it's one of those areas which is somewhat grey with regards to 'alighting clear'.
If you allow a (conservative) 1 mile per 500 ft glide ratio, then crossing at 2400 feet will give you almost 5 miles in nil wind. This will get you into LCY or the Lea Valley reservoirs if you choose your route carefully.
The point is, what does alight clear really mean? Is it sufficient to pitch into the reservoir or must it be completely clear of all built up areas (i.e. Essex).
I know we could talk about it all day, and most people don't want the boat rocking..
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"Take-off is optional, Landing is mandatory"