Did you know there are some free bus services around London Heathrow that are ideal for spotters moving around the various perimeter locations?
Bus service between Hatton Cross and Terminal 5 are:
423 via northern perimeter road, Bath Road and Longford village.
441 between Central area and Terminal 5 via northern perimeter road
482 and 490 via Terminal 4 and cargo along southern perimeter road.
All of these buses are free between Hatton Cross and the terminals. They will help you travel between spotting locations at Runways 27L, 27R and 09L for viewing when runways change.