Originally Posted by
bibbju
Use these guys:
http://www.airporttaxis-uk.co.uk/
I use them for Gatwick late night pickups and they're reliable. They're quoting £51 for Tottenham Hale to Heathrow.
I would look no further than this. If, like me and many people, you're a little risk-averse when it comes to missing flights, the public transport options are going to be cutting things too fine for comfort.