Pedestrian access to LHR
Is it possible to walk into LHR? I first thought of this flying back on 7th July last year, worrying about busses / tubes etc), but now I work in Stockley Park, about 2 miles from Terminal 1, a relatively easy 40 mins walk, but the tunnels have no pavements (or gas masks for the fumes).
Is it possible, or just a weird thought?