Richard J. wrote:
[snip]
To Hammersmith (for taxi to Bayswater): 00:04 from Heathrow, arr.
Hammersmith 00:34

Alternatively, the number 27 bus is right upstairs and takes 18 minutes
(allegedly) from Hammersmith bus station to the Westbourne Grove end of
Queensway. It goes about every 15 minutes until 00.38, then half-hourly
all night.

James.