So much for the age of austerity: Cameron's new gas-guzzling Jaguar which has cost the taxpayer £200,000

He had previously said that Government Ministers should take the Tube to slash government spending.

But David Cameron doesn't appear to have listened to his own message in the age of austerity.

Sitting proudly in Downing Street today, this is one of Prime Minister's fleet of bullet-proof Jaguars that take him to official engagements.

Silver machine: One of Mr Cameron's fleet of Jaguar XJs sits in Downing Street today. The car has been specially modified for carrying the Prime Minister

Popular image: David Cameron was often seen riding his bicycle around the capital - although that wasn't bullet-proof

Costing more than £200,000, the luxury XJ X351 model is specially modified for carrying Mr Cameron and contains many features to stop a potential terrorist attack.

While many details are classified, Mr Cameron's model reportedly features special bullet and bomb-proof security armour, run-flat tyres, bullet proof glass and even a self-contained oxygen supply.

The car also allegedly has gun ports for security staff to return fire should the car be attacked.

The car has a 5.0-litre supercharged petrol engine which produces 503hp and a top speed of 165mph. In comparison, a standard showroom XJ produces 385hp.

Petrol wise, a top of the range machine will produce 23.4 miles per gallon, while CO2 emissions total 289g/km. Filling the tank will set the taxpayer back £104 - and only then does 421 miles.

The standard model also contains a touch screen navigation system, massaging seats, and a 600W sound system with hard disk drive and media hub.

The car shown above is part of pool of cars that take the Prime Minister on visits and transport him around the capital. It has been in use since October.

The car is operated by the Metropolitan Police and run by the force who pay for its upkeep.

Last week, Mr Cameron has said that his sole complaint about being Prime Minister is that he is unable to drive his beloved Honda CRV for security reasons.

During a trip to the Honda plant in Swindon, he told employees: 'This beautiful machine sitting outside Downing Street, and I've not been in it for nine months. Just imagine the tragedy.'

In the years leading up to his election as Prime Minister, Mr Cameron could often be seen riding around London on his bicycle.

However, the PM-in-waiting had a run of bad luck when he had two bicycles stolen in the space of a year.

In July 2008 he found himself stranded on his way home from work when teenage thieves made off with his bicycle as he shopped for salad. He had chained it up in Portobello Road, West London, as he went into a Tesco supermarket near his home.

Then in May 2009 he fell victim to thieves once again when his £250 mountain bike, which was chained to railings outside his West London home, was stolen.

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