With a price tag of £1m when new, and a limited production run of just 375 original examples, the McLaren P1 hypercar is as hard to get your hands on as it is desirable. But one example has recently come up for sale, and though it may look like just another used P1, this one is special. 

Available through Tom Hartley Jr in the UK, this 2013 McLaren P1 is one of just 14 'Experimental Prototypes' that were built prior to the 375 unit production run. These 14 cars were tested extensively in some of the most extreme conditions – from Death Valley to the Arctic – prior to the launch of the production model in 2013.

McLaren P1 Experimental Prototype
McLaren P1 Experimental Prototype

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This particular example was one of just a handful that wasn’t crash tested, instead it was used for gearbox and Bosch injection development. It was later used as a GTR show car at both the Geneva and New York motor shows, before being stripped down to its carbonfibre monocoque and rebuilt to the same specification as the 375 production cars.

Everything from the body panels to the engine has been rebuilt around the original prototype chassis. The exterior wears a bright orange finish, and bears the designation 'XP05' on the rear quarter panel, and XP stitching in the headrests. Under the bonnet is the same 3.8-litre twin-turbo V8 hybrid found in production models, delivering 903bhp overall.

Gallery: McLaren P1 Experimental Prototype

The car has only had one owner since new, and has driven just 300 original miles. The dealer doesn’t say how much the supercar will set you back, but don’t expect to pay anything less than seven figures. A well-kept P1 easily fetches over £1.5 million on today's market – this rare prototype vehicle shouldn’t go for anything less than that.