The US suffered a similar incident in 1968 (see below)
http://www.usspueblo.org/v2f/incident/incidentframe.html
Quote from site: “The USS PUEBLO, which was captured by the North Koreans in 1968, was the first U.S. Navy ship to be hi-jacked on the high seas by a foreign military force in over 150 years. To date, the capture has resulted in no reprisals against the North Koreans; no military action was taken at the time, or at any later date. This lack of military response guarantees the Pueblo’s place in history as a watershed event in our national conscience.”
From what I understand this event caused a comprehensive and in depth review of ROE’s, no doubt the Brit’s will be going trough the same soul searching process.