Ambassador, British Airways; FlyerTalk Posting Legend
Join Date: Apr 2012
Location: Leeds, UK
Programs: BA GGL/CCR, GfL, HH Diamond
Posts: 43,196
so you can get the 482/490 TfL buses right outside. Go down to the car park level and the bus stop is about 100m to the right when you get to the pavement.
Personally I wouldn’t have walked all the way to T4 itself to get the HEX/tube since that would require a change anyway.