Incidentally the existing Hilton Doubletree ferry is going Ro-Ro which will make it more practical, although it's not clear what the fare will be. https://www.thamesclippers.com/news/uk-first-fully-electric-cross-river-passenger-ferry-to-launch-in-london If it's the existing £4.10 single pay-as-you-go fare, it is frankly dead on arrival.
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I've long believed this is per mile the most expensive ferry journey in Europe.