Tickets to 'London International (CIV)' offer a few benefits that regular train tickets don't, the most important one being that if your UK train into London is delayed (a rarity, we know...) and you miss your Eurostar as a result, Eurostar will put you onto the next available service where there's space. Additionally, if you arrive into London at a station that isn't St Pancras (or King's Cross), tube travel from that station to St Pancras is included with a 'London International (CIV)' ticket.
Before you go trotting off to your local station to buy one of these special tickets for posterity (let's face it, paper tickets won't be around forever), know this: You must have a Eurostar ticket in order to buy one. For this reason, they're not available to be purchased separately.
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