CJB wrote:

Passengers may travel between Central London and Heathrow Airport on
London Underground, but a new ticket will need to be purchased.

The latter part is a disgrace, unless easy-to-obtain-from-abroad refunds
are being given on the much higher HEx fare. If they are, this makes
sense.

Neil
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Neil Williams in Milton Keynes, UK. Put first name before the at to reply.