Joe wrote:
wrote:
Why not use the Piccadilly?
Given I'd be coming from Cockfosters, I think I would probably die from
bordeom (it's bad enough coming from Covent Garden!) 
If it's interesting you want...
Piccadilly to Manor House, walk to Haringey Green Lanes*, Sprinter to
Gospel Oak, NLL to Gunnersbury, H91 to Hounslow, whatever buses go to
Heathrow from there depending on terminal.
* A mate lives near there - I usually take the NLL/GOBLIN over the
Piccadilly for boredom avoidance. It's comparable on speed, too.