On Wed, 20 Feb 2008 04:13:41 +0000, James Farrar wrote:

Your long post omitted to mention the service I use when I must use
Heathrow and can choose the mode - Heathrow Connect (HC)
http://www.heathrowconnect.com/.
30 minute service interval and about 30 minutes travel time.
Roughly half as expensive as Heathrow Express (HE) which has double the
service interval and half the travel time.
Roughly double the cost of London Underground and half the travel time.

Depending, of course, on where in London the traveller is travelling
to/from.

Indeed. I'd say HC actually takes longer on average than the Picc for
most destinations, due to having to wait up to half an hour for a
train (versus 5 mins on the Picc).