How time flies [sic]! My ‘about a decade ago’ was in fact 2004 - I recall subsequently reading this BBC report: http://news.bbc.co.uk/1/hi/england/essex/3529310.stm and remarking that Mr May of the Essex Wildlife Trust was clearly incorrect in his observation that "Some are going out to sea but after a while they get tired and fly back”, because most of them cadged a lift with us.