In message , TheMiz
writes

OPPS sorry its 100 Queen's Gate

In that case your hotel is less than 500 yards from the Piccadilly line
at South Kensington Station.

By far the best route is to take the Piccadilly line direct to South
Kensington - I would still recommend taking the bus replacement from
Terminal 4 to the Piccadilly line station at Hatton Cross, but taking a
free ride from T4 to Terminal 1-3 at Heathrow, and joining the
Piccadilly line there, is an alternative.

Whichever you do, taking the Heathrow Express all the way to Paddington
would be an expensive mistake that would take you well out of your way.
The Piccadilly line is far more direct.

--
Paul Terry