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'I'm still waiting for an email' would be an appropriate response these days. It takes days and days for a reply (I tried to change trains because the French ones from Basel were booked out - that follow-up email took three days).
In the end it was just my bike boarded both ways. But they both had three members of staff ready and available to carry my bike bag and put it on the trolley.
No chance, even in pre-brexit days they didnt allow this. I tried a couple of times. Fuck Eurostar, driving is way easier.