Being one of the richest people on the planet means the sky’s quite literally the limit for the Sultan of Brunei. Not only does Sultan Hassanal Bolkiah own a fleet of private aircraft – he flies them himself.

The pick of his private jets is arguably a Boeing 747 he bought from Lufthansa, reportedly for around $100 million (£76m). The Sultan then splashed out a further $120 million (£91m) to seriously upgrade the interior, adding features such as washbasins of solid gold.