The easiest thing to do is to get the Piccadilly Line straight from Heathrow to Russel Square or Holborn; no transfers, just the one line.

Ditto on the Piccadilly Line (tube, known elsewhere as metro, subway etc.). Buy an Oyster card: https://tfl.gov.uk/fares/

https://tfl.gov.uk/plan-a-journey/

there is an app as well. note information on each route

At LHR, follow the signs to UNDERGROUND not Trains To London. After the moving walkway, you will see the ticketing machines to the Right. Buy an Oyster Card. Take the Piccadilly Line to Holborn or Russell Square.

Holborn is pronounced Hole Burn.

Thin,aristocrat 🚀

Could not be more wrong. See: https://www.oxfordlearnersdictionari...nglish/holborn

Definitely 100% do NOT take the HEX to Paddington! Where exactly are you staying -- that will determine which station Russell Sq or Holborn. You do not have to go as far as St Pancras/Kings Cross.

However - how much luggage will you have? Hopefully you are traveling light because the tube can be a bear (especially exiting the stations) with large luggage. If you do have a lot of or large luggage, consider a pre-booked car service like justairports.com The driver will meet you as you exit Arrivals and drop you at the door. That would save the slog to the tube at LHR - no steps but a fairly long walk, and the slog at your destination station.

"Hole Burn" ...... if only. Try O BuN

But thin is an 'aristocrat' so he pronounces things funny

Holborn is most definitely pronounced Hole Burn.

You are all daft.

Thin,aristocrat 🤓

uh - no. It is not

I presume you know by the time you are on a tube, you will be traveling during the weekday morning rush hour.
If you have multiple contact less credit cards (you mentioned "we") it is possible to use them at tube turnstiles without buying Oyster Cards. However the is a big difference if you drop and lose your card during the hustles and bustles of going through the turnstiles. With an Oyster card, you loss is limited to the balance on the card while with credit cards, you need to block your cards and travel the rest of the trip with one less credit card.
https://tfl.gov.uk/fares/how-to-pay-...-pay-as-you-go

>>With an Oyster card, you loss is limited to the balance on the card <<

There is no loss if you register the card . . .

The tube won't be terribly busy at 8AM and they would be boarding at the first station so would be guaranteed seats.

IM experience getting on the Tube at Heathrow means you are on the train BEFORE most of the so-called "rush hour" passengers.

I've been a Southerner all my 43 years and I pronounce it "hole burn" and so does everyone I know.

Janis, as far as I know you cannot register an oystercard without a UK address... at least it was the case over the summer when I tried to register mine.

Visitor travelcards can't be registered -- but AFAIK regular one can if you fiddle with the phone # and address fields. (I didn't do it but my cousin did - using her hotel post code)

I have never heard the 'L' pronounced. (except by visitors who also pronounce Thames and Marylebone as they are spelled)