After testing a crude version of their technology in 2007 on the Lincoln Park Municipal Course in San Francisco using GPS devices and HD cameras, the prototype proved that they could accurately map terrain and create a realistic game experience.

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So Quinn, now 71, and his wife, Jane, 66, persuaded their kids to park the money in municipal bonds while they agreed on a strategy.

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Birkenhead Park was opened on Easter Monday 5 April 1847 by Lord Morpeth and is regarded by some historians as the world's first public park, and was also one of the UK's first municipal green spaces.

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As for that famous car park, it is currently out of bounds due to its continued use by municipal staff parking.

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