Kings X will be as busy if not busier than Holborn at that time of the day and there are just as many escalators. However, there are also lifts (I think) following the refurb and it's generally a nicer interchange than older tube stations.
Are you coming in from Cambridge/ Cambridgeshire? If so, and you just have to get a train to either Liverpool St or Kings X then I would probably go for the Kings X option.
They're not ridiculous questions and I am like you - I like everything planned in detail too!
Hmm, we'll have a big suitcase and smaller bags, so really dreading those big escalators with everyone pushing past.
Would Kings Cross be better for keeping track of DD AND the suitcase without being trampled? Is it likely to be more busy than Holborn?
Sorry for the ridiculous questions! Although I can read a tube map, I don't go to London very often, and I want to make sure we don't arrive at the airport too frazzled and sweaty. Plus I usually plan everything in minute detail.
Oops, sorry for not replying sooner. Hope your journey wasn't today!
It's a pain because there's no step free access between the platforms and it has long escalators as well as sections of stairs. It gets very crowded. 9am, if a weekday, will be peak rush hour as I imagine you've realised! Depends how much baggage you have.
But... it's still cheaper than the Heathrow Express!
From Liverpoool st you can take the tube. Central line to Holborn then Piccadilly to T5 but it's a long and very boring journey.
However, you'd still need to take the Circle or Hammersmith & City line to Paddington from Liverpool st to get the Heathrow Express. It's not an easy journey whichever way you look at it as you're going east to far, far west
I don't know why the Heathrow express is so ridiculously expensive