On Jul 1, 11:39*am, Frederick Williams
wrote:
There used to be a very convenient Virgin bus running between Watford
and Heathrow. *It no longer runs but there is a Geenline (?) bus: slow
and with inadequate baggage facilities. *Is there a convenient train
plus underground route? *No stairs please because the passenger will
have both a suitcase and an over-night bag to carry.

It's Green Line (http://www.greenline.co.uk/) not Geenline - it's
route 724, and is an express bus service that stops at four places
between Watford and Heathrow. It takes an hour and a quarter or so, a
bit longer during peak times when traffic will be heavier. The actual
bus used is a single decker which has extra luggage racks fitted so as
to cater for flyers heading to or from Heathrow.

The timetable is available from the Green Line website here (PDF):
http://tinyurl.com/lpm2go

Otherwise, if you're trying to do it without stairs then it's a bit
fiddly. From Watford to Euston one would take the train, then from
Euston one could take the 205 bus - which stops on the other side of
Euston Road - to get to Paddington, and then take either the Heathrow
Express (pricey) or Heathrow Connect (cheaper, but only half-hourly
and takes a bit longer) to Heathrow. Or otherwise take a cab from
Euston to Paddington.

If a step-free option is important, I think I'd recommend just taking
that 724 express bus. None of the various Underground options are
entirely step-free.

Where's the passengers starting point - is it Watford or elsewhere? If
it's elsewhere there may be other options.