In message , at 14:40:55 on Fri,
8 Aug 2008, John Rowland
remarked:
Assuming that the trains are running normally, would it ever be
quicker to take a T4 train to T123? I'm assuming it would always be
slower, as not only is there the wait at T4, but travelling via the
loop is also slower.

Frankly, worrying about 5 minutes here or there on the trip to
Heathrow pales into insignificance against the two hours you will
waste in various queues having got there.

... unless they happen to be the 5 minutes difference between catching and
missing your plane.

Which will only kick in if you are already horrendously late. Catching
up five minutes by queue-jumping inside the airport is a more likely way
to catch a plane in those circumstances.
--
Roland Perry