I thought the Flixbus from Amsterdam to London (10 hrs + 2-hr border delay) Easter weekend 2024, €50 only, was going under the English Channel but instead went above it by 90-min ferry (Irish Ferries) in Calais. Good WiFI onboard the bus, but it does not stream any of the streamers even Apple Music. Vodafone NL works just fine roaming on the sea and in the UK.

I returned by it again (12 hours + no delay). Punctual in both cases + a large 2AM free meal +on drink on the London to Amsterdam route which used different ferry company, DFDS , with a longer and slower 180-min English Channel transit to Dunkerque.

Would I do it again? Probably not... However, for intercity routes in the UK it is brilliant! If you book the AMS - LON version which uses the Euro Tunnel, while the undersea-crossing is faster, that journey has more city stops + waiting trasnfers, and the travel times are all 10-12 hours either way.

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