As outlined in a related question, Eurostar charges less money for short-term return trips than it does for one-way trips. Assuming one only needs a one-way ticket to/from the UK and buys a throwaway return ticket, can they expect any issues later on?
I'm mostly interested in how it works in practice, not what it says in their T&C.
will be liable
- time to switch to throw away payment cards for each transaction...