HMS Duncan, a Royal Navy Type-45 Destroyer, was in port in Montenegro when Sergei and Yulia Skripal were poisoned in the Wiltshire town. Montenegro was part of the communist block during the Cold War and many links remain with Russia. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings. In a text message sent out to all 280 crew part-way through three days of shore leave, the ship’s company were told: ‘The Defence Attache has informed the ship that Montenegro authorities have been made aware of a [redacted] group that will be in the area this evening. Therefore all ships company are to return… British sailors were recalled to their ship after fears they could be targeted in the wake of the Salisbury nerve agent attack, a new documentary will show.