The Silk Trail 2013 expedition has reached the half-way mark from its starting point at the home of Land Rover in Solihull, UK, to its destination in Mumbai, India.

Twenty days after setting-out, the three Range Rover Hybrid prototype vehicles reached the deserts of central Asia on the ancient Silk Roads that inspired the name and route of this epic journey.

The convoy has covered 8,411 kilometres.

In its third week, it travelled through Kazakhstan and much of Uzbekistan.

The Range Rover Hybrids, in their final validation test before sign-off for production, have taken in their stride a variety of punishing conditions: asphalt surfaces riddled with deep potholes and layered with stones; mud tracks that have been dry and dusty desert trails.