according to a friend of mine it is possible to travel from England to New York state fairly easily by cargo vessel and costs about £400 each way (including food but unlikely to be vegan, though there is often the possibility of having stuff veganized and if you bring canned marinated tofu and the like you'd be set) Accommodation is apparently quite comfortable in the guest cabins too, though it takes about a week to get there.
Personally, a 7 hour flight from Heathrow to JFK has got to be better than a week in a very comfortable prison.
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