Re: Heathrow
I don't know anything about the cost of tickets and all that, but I used the tube from H'row to London the other day for the first time and it was not at all satisfactory. The office I was going to is only about 50 metres from Piccadilly Circus tube station so the tube from H'row seemed ike a good idea.
First of all, on the way from H'row to London, the train terminated about one third of the way in because of a suspicious package on the line. Had to get off the tube, into a bus to a station further down the line, back on to the train, and arrived about an hour late for the meeting.
then, on the way back from London to H'row, we were all packed in very tightly, so tightly in fact, I needed a shower by the time we arrived at H'row!!
The cost of the return ticket was £7.60. Next time I'll use the H'row Express to Paddington (£25 return) and get a taxi the rest of the way.
Yes, I know this is nothing to do with the original question, but might be useful to some people.