I checked Heathrow to Stratford thinking with Elizabeth Line (??) it may be faster for me to fly from Manchester Airport to Heathrow, then take the train to Stratford - but if memory serves every trip requires a change, and sometimes a long wait, meaning I'm better going Manchester to Euston, tube to Tottenham Ct Rd and Liz Line from there.
Basically, if my memory was correct, I find it bizarre that part of East London doesn't connect directly with Heathrow!
Up here in the north, Liverpool Airport should have a rail link, or even a direct bus to Parkway station; they are missing out on many - like myself - who are fed up with Manchester. Indeed while it was still a commercial airport, Blackpool has an easier rail connect than Liverpool!!