I will be in the UK using my Britrail pass; can I validate the pass at Heathrow Central Station before boarding the Heathrow Express to Paddington or can I just jump on with out the pass validated? Cheers...
Yes you will have to validate it before you get on the train. Go to a ticket window with your paperwork and the ticket clerk will do the necessary.
I will also be arriving at Heathrow and using a Britrail pass for the Heathrow Express first thing.
Does Heathrow Express have its own window? Do I go to that or a "regular rail" window for validation?