I am looking at transportation possibilities for 4 adults from November 29th to December 2nd. We are flying into the Heathrow Airport, and flying out of Stansted a few days later. I was wondering what is the best way to get around while in london? We don't really want to hassle with renting a car and parking. I know there is a Heathrow Express Train and a Stansted Express Train. Is this the easiest/cheapest way to get to and from London? Then just use the Tube while in London? Is there any way to get discount passes in advance? Thanks!