I heard about the new Heli Site - but have yet to see anything on radar go in there.
From an ATC perspective, there will be traffic at 3000ft descending ont he 28ILS - and you are clsoe to the edge of the LCY zone. Also - don't forget that the zone to the EAST will be moving 1.5nm towards DH - with a little CTA from 1500-2500ft.
Oh - and everyone routeing via the QE2 bridge tends to route just to the East of it to ensure they avoid the zone.
When Breeze heliport started, they come and talked to TC at West Drayton - if the new operation touches base I will let you know.