your example is wrong because LHR is linked to Bristol by the M4 which isn't at all bad as far as traffic goes westbound.
there is also a damn good train service between London & Bristol
Please read the thread before posting. As I have just said:
Quote Silver:
b. The car will get you there, but the parking will be more than the ticket price. Plus not everyone wants to dice with death or risk being late, because of the diabolical M4 (or M1 or M6 or whatever).
c. The train will get you there, but an hour after the flight departs (no overnight rail services on the UK's decrepit railways.) That means an overnight in a hotel, and more expense.
The net result, is it is cheaper and easier to fly KLM to AMS (4 flights a day) and use that as a hub. And at £140 return, it is much cheaper and easier to go to AMS than take the train or car to LHR.
This is the problem with the present London hub. If you make things so difficult and so expensive, people will go elsewhere. And so London loses out, and so does BA lose out. RIP London as a business center. RIP London....
Endquote.
Silver