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Ha,
I was implying that the distance you have to walk from arriving at the doors of the terminal to the door of the plane was (almost) as far as walking from Slough, with exaggeration for effect.One possibly could walk to Terminal 5, but the approach ramp to the entrance floor does not have pavement.
There was, (pre-Covid), provision for bike parking at T5, although, it's not clear there is sufficient security to leave a bike there for any extended period
Heathrow Terminal 5: might as well walk from Slough.