Finally did a helicopter tour over Heathrow and Central London the other day - thanks to EBG for the helicopter, instructor and much help on the flight. And to my son who came along, for all the pictures (he took about 200, juggling two cameras).
We did H9 over Heathrow, H10 from there to the Thames, then H4 along the river to the Isle of Dogs and back to Redhill. There was some concern about the time we might have to hold on H9, but in fact we hovered for less than a minute south of 27L while the Air Canada 777 in the first picture landed, then we were cleared across both runways.