London Heathrow Airport (LHR / EGLL)
The spotting locations I have used to create my videos are shown below. While there may be other locations available, the ones below are the locations I have used to film my YouTube videos.
RUNWAY 27L/09R
One of the spotting locations I have used so far at Heathrow Airport is the field at the end of Myrtle Avenue. This spot is ideal for arrivals on runway 27L, and also not bad for departures from 09R, though some planes are fairly high by the time they get to you. As with all locations around Heathrow, cars, fences and lamp posts are guaranteed to get in the way.
Here are some examples of videos I have taken from this location:
How to get here
This location is accessible by car however I have never tried this and dont know how easy it is to park in Myrtle Avenue or the surrounding roads, though I expect it can be done quite easily. An alternative is to travel on the Underground to Hatton Cross Station. Then it is a short walk across the road and past the BP Garage to the field.