Lichen discolours ancient horse

Chemicals cannot be used to brighten the horse

One of Wiltshire's famous white horses has become so discoloured there are calls for it to be cleaned up.

Despite recent measures to remove lichen growing on the ancient landmark - a major tourist attraction in Westbury - it is still looking grey.

Whitening the monument is not a simple procedure as it is a protected site and chemicals can not be used to clean it.

English Heritage says it is looking into how to stop the greying but needs to wait until the weather is better.

Westbury's horse is the oldest in Wiltshire. It was restored in 1778, but many believe it is far older than that.

It is thought to have been carved in 878 AD to commemorate King Alfred's victory over the Danes at the Battle of Ethandune.