Worried that your 4X4 lacks off-road credibility as you mount kerbs and flatten speed bumps in the city? This Shropshire firm has the answer - Sprayonmud.

Instead of heading for the nearest field and churning up beauty spots, drivers can pay £7.95 for a bottle of real Shropshire mud.

A quick squirt and gleaming Chelsea tractors can be transformed into round-the-world voyagers more at home on the High Veldt than the High Street.

Unsurprisingly, London is the main market for Sprayonmud, though there has been interest from around the world especially Germany.

The plastic bottle is just the right size for hiding in a green Wellington boot. Keep it in your garage, in the boot, or anywhere you like. Just be careful the neighbours don't catch you using it! And remember, you've been visiting friends in the country!

There have been reports that many drivers are buying the mud to cover up their number plates and avoid being photographed by speed cameras.

Sprayonmud is NOT to be used to obscure number-plates or the lights on your vehicle. This, of course, is illegal and while it is not an endorsable offence, if your number plates cannot be read at a reasonable distance, or photographed by a speed camera, you could face a fine.

Drivers of large 4X4 vehicles have been coming under increasing attack in cities such as London.

Environmentalists have slated them as gas-guzzling polluters, while safety groups have said they are a hazard to other motorists, cyclists and pedestrians.