How does the train ticket pickup system work in practice?
I am about to go on a quick jaunt to England where I will be flying to Heathrow and from there taking a train to Swindon. I pre-ordered my tickets online, paying through PayPal, and was told I could pick up my tickets at a ticketing machine as long as I had my reservation number and a valid payment card.
I am arriving from the Netherlands, so passport checks should be minimal.
How does this actually work, and are there any common pitfalls I should be aware of?
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