Why a £155,000 prototype Aston Martin spotted on the streets of Calderdale and Huddersfield - and who was behind the wheel - remain a mystery.

Police got more than they bargained for when they stopped the flash sports car in Rastrick last night.

Officers from the West Yorkshire Roads Policing Unit caused the car to stop and spoke to the driver.

Turns out it was a prototype Aston Martin DB11, a secret new model and the only one in the UK.

The RPU tweeted a picture of the car but Aston Martin insisted they blur it out – completely!

Now there is intense speculation as to why the supercar is being driven around the streets of the region.

Aston Martin – once part of David Brown’s in Huddersfield hence the initials – is about to launch a new 600bhp twin-turbo GT model.

See the car in action below

Video thumbnail, Aston Martin DB11
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Revealed at the recent Geneva Motor Show, it boasts a top speed of 200mph and hits 0-62mph in just 3.9 seconds.

Expected to cost a whopping £155,000, it's reputed to be “the most significant Aston since the introduction of the DB9 in 2003.”

Dr Andy Palmer, Aston Martin’s chief executive, said: “A brand new bonded aluminium platform, clever aerodynamics, a new characterful twin-turbo V12 and class-leading infotainment systems are just a few aspects which make this the sports car that will proudly spearhead Aston Martin’s second century plan.”

The most famous Aston Martin driver is, of course, 007 James Bond but the Examiner cannot confirm whether a Mr J Bond was at the wheel of the one stopped in a quiet Rastrick street.

The new car is expected to released to customers towards the end of 2016.