The Summer Solstice is likely to be welcomed in by a record crowd at Stonehenge, police have said.

Thousands of people are expected at the twin sites of Avebury and Stonehenge in Wiltshire to celebrate the longest day.

Last year's total of 30,000 revellers could be exceeded, with police warning of a zero tolerance approach to drugs and drunkeness.

The event to mark the dawn of the longest day in the Northern Hemisphere has grown in popularity since a four-mile exclusion zone around the site was lifted nine years ago.