@h0m54r @jon #Trainsplit will sell a #CIV ticket online but you have to ask for station #LondonInternational (LNE) (not St Pancras Intl) and then use something like a "more ticket types" to avoid being given an less-protected more-expensive "London Terminals" ticket. You do have to show your #Eurostar ticket with it. This really should be easy and on all those platforms, especially with so few UK ticket offices left and those on shorter hours.