To anyone else coming to State of the Browser from London Heathrow today - the signage for the Underground initially takes you down to the Piccadilly line.
Should you want the Elizabeth line instead, you have to switch back and go down a different set of lifts/elevators.
I don't know if the entry point to the Liz line ends up charging more? Who knows. Either way if you end up at the Piccadilly line it's not because you've missed a sign - a sign that should exist, and doesn't π€ͺ