Designer Daily is in fact a blog written by Mirko Humbert, a Swiss graphic designer.

FORBES: Connect

"This isn't a good-looking vehicle by any stretch of the imagination - but is of social and historical interest, " said Mr Humbert.

BBC: Margaret Thatcher's "Battle Bus"

It was one of the Swiss delegation, Pastor Humbert Droz, from La Chaux de Fonds, whose report to MI6 in London appears on the file.

BBC: Secret files reveal Franco plot

It also has a Foden chassis, a body by Glover and Webb and is powered by a 12-litre Rolls-Royce engine, Mr Humbert of JP Humbert Auctioneers said.

BBC: Margaret Thatcher's "Battle Bus"

Auctioneer Jonathan Humbert said the bus, which can hold 35 passengers, has just 28, 000km (17, 398 miles) on the clock and it has its own auxiliary generator and air supply in case anyone attacked it.

BBC: Margaret Thatcher's "Battle Bus"

With her artist's eye, her self-deprecating humour, her talent for spotting the absurd and her palpable sense of outrage, Humbert was an irresistible companion, who offered a riveting day-by-day account of the genesis of the Resistance.

BBC: Agnes Humbert 1930s