I had a miserable journey back from ABE on BA1315. It was delayed leaving ABE by 25 mins (probably from earlier flight delays getting up to ABE), then we had to circle round Watford for 15 mins due to congestion (pretty normal though) while waiting for a slot at LHR.
Then they dumped us at a stand with steps and busses waiting (it was Concourse B but with no jetty access to the terminal), however there was nobody able to operate the steps. Queue another 15 - 20 mins sitting on the plane (even the pilot sounded pretty pee'd off).
Overall not a pleasant experience and there were some frantic travellers rushing to catch connecting flights, thankfully I wasn't one of them.