On 8 Nov, 09:34, Andy wrote:
Is that just an out of date website?

Yes. The press office definitely thinks they accept PAYG.

the Hayes -
Paddington section of the Heathrow Connect is operated on behalf of
First Great Western

Almost. The trains and the staff (which are owned/employed by
Heathrow Express) are sublet to First Great Western for that part of
the journey.

U