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Ms Butler said Mr Greenaway would use the proceeds of the sale to fund his laughter yoga sessions, which would involve training carers at a children's hospice and in the NHS.

Ms Butler said the "bidding was fierce" but that Mr Greenaway "had people rolling about laughing" during the sale.

She and her husband Ivan Greenaway, 72, first began swapping their home in 2015 - but not without reservations.

Earlier this month, unions withdrew their support - with GMB Scotland's senior organiser Keir Greenaway telling the BBC that the scheme would only add more bureaucracy to the sector.

"These aren't missions that you put up to be cheap and quick, to solve small problems; this is complex. The reason Earthcare has taken so long is because we want the gold standard," said Dr Beth Greenaway, the head of Earth observation at the UK Space Agency.