Portsmouth's greatest fortress now on audio tour

Portchester Castle – some say the greatest Roman fortress in Europe – will be an even bigger draw for yachtsmen visiting Portsmouth Harbour this year.

For the keepers of the ancient monument have upgraded their audio tour which explains the fascinating history of the castle where Henry V rallied his troops for Agincourt.

The current issue of Yachting Monthly carries an unusual photograph of the castle which councils plan to include in a water bus route.