The British government acknowledged today that a submarine periscope had been sighted in waters near a main U.K. base, (off west Scotland), touching off a massive NATO hunt in November.....A pair of U.S. Navy P-3 Orions, as well as Canadian and French planes and two British warships, scoured the waters for days when the periscope was seen in November.
Link:http://abcnews.go.com/blogs/headline...-in-uk-waters/
More detail:http://www.telegraph.co.uk/news/ukne...sh-waters.html

Embarassing as the UK has no maritime patrol aircraft. Even more as the only 'main' UK base in western Scotland are the Trident SSBN facilities in the Clyde. Taken alongside the current higher level of Russian flights and probing it is to say the least interesting.