Sorry...another question from me.
I am 21 and looking to get a ticket to Paris from London on Eurostar. Should I buy the cheaper non-changeable ticket, or spend more and have the option of a refund/being able to miss my train and get a ticket for another? I'm worried that something will happen and i'll miss my train and basically regret my basic ticket...or am I misunderstanding the website and ticket options? What type of ticket should I buy?