[ghaff]

In London, you also have the Piccadilly line depending upon where you're going and how much luggage you have (many of the London tube stations are pretty awful in terms of accessibility as I discovered on a trip where I had heavier luggage than normal last year).

[Symbiote]

Since 2022 there's also the Elizabeth Line, which uses the same tracks as the Heathrow Express, but then continues under Central London and far to the east.

It takes 27 rather than 15 minutes to Paddington, but it's also half the price of the Heathrow Express.

It's the purple edged line: https://content.tfl.gov.uk/london-rail-and-tube-services-map...

[ghaff]

Right. But I usually stay near Trafalgar Square and the Piccadilly line is much more convenient for that. (Though I will be taking the Elizabeth line from LHR my next trip because I'm initially going to Shoreditch. And, yes, Heathrow Express is something of a rip-off which the airport steers you towards.)