In message , at 13:49:00 on
Thu, 29 Dec 2011, Paul Corfield remarked:
And how many airline passengers have Oyster cards?

Quite a few I would imagine, given the number of people living in
Greater London who have them and who might well be flying out of
Heathrow.

And the thousands and thousands of staff who work in and around
Heathrow.

Why are the staff taking trains from one terminal to another? If their
job requires moving around the airport I'd expect the employer to
provide an [airside] alternative.
--
Roland Perry