Paul Terry wrote:


A cheaper rail+tube route is Stansted Express to Tottenham Hale, then
Victoria Line to Green Park, then Piccadilly Line to Heathrow - about 2
hours in all, and the interchange at Green Park is inconvenient if you
have much luggage.

Change at Finsbury Park for cross platform connections - there are a
couple more stops if you pick up the Piccadilly here rather than at
Green Park, but worth it to avoid the walk at Green Park

Stephen