Originally Posted by Mizter T

It's possible to walk between T5 and Longford (a village on the north west perimeter of Heathrow) if you're prepared to ignore a sign or two and carefully cross a short bridge intended for buses and cyclists only, which has no pavement ...

Heading to T5, once across the bridge from the roundabout you can take advantage of what very much looks like a pedestrian crossing, even though it's actually for bicycles, and end up on a pavement ...