Plans for a £250m upgrade of a major road network could be disrupted by a butterfly.

Last week, Kent County Council revealed plans to improve the A229 Blue Bell Hill which connects Chatham to Maidstone.

The plans contain a raft of new slip roads and roundabout enhancements, but one of the measures is for an additional lane and a new slip road on the southern-bound carriageway heading to Maidstone.

That would plunge it through the habitat of the Green Hairstreak butterfly.