Where is my passport?

I don't remember who, but someone once said, "preparation is everything" — no doubt he was a geek. Well due to the last few weeks being mayhem, I now have less than 20 hours to prepare myself and get to Heathrow airport for my flight to Thailand. This being my third trip, I guess I shouldn't be so worried — for me it is a lot less worrying than travelling to London. The good news is that I have located both my passport and my flight tickets, so I feel I am halfway there already! Just got to say a few goodbyes… To all those in this country, make the most of this cold weather and drink plenty of tea for me. All you Warwick people: enjoy the rest of term and see you when I get back or next term. All of you in Thailand: sawasdee krub and get the mango in, cause here I come!

Now, how does one find their way to Heathrow airport?