Londoners: What's the best public transport option from Heathrow to Kings Cross?

[Dogtrousers]

Sounds like a more expensive way to add complication to the journey and save perhaps a few minutes.

That's exactly what the Heathrow express is now. The Elizabeth Line has completely undermined its main selling point. I used to use it cos it is quick & frequent. But only if you happen to be at Paddington.

 

[Andy in Germany]

Well, this is turning out to be the complete nightmare I expected: Now I can't get a Britrail pass. I'm eligible, I have a MasterCard, I have the funds, but my banks' confirmation app "doesn't work on your phone".

Why don't I trust mobile phones with my banking and tickets? Ah, yes that's why...