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The company is seeking private and public funding, but Sheen said self-financing it initially would allow it to stand "on its own two feet".

They recruited friends Anas Omar and Henry Harte to film their travels and, self-financing their mission, they set off.

Last month Transport Secretary Fiona Hyslop said there had been an increase in passenger levels of about 6.8% during the pilot but it would need to be 10% in order for the policy to be self-financing.

But it's suggested he has to be self-financing if he wants to fulfil the requirements to keep up the maintenance of the 19th Century listed building.

"They are entirely self-financing and have much greater autonomy in how they're run than we do," he told BBC News NI.