From April 2008, the UK Border Agency took on responsibility for vessels which had previously been operated by HM Revenue and Customs and were formerly the responsibility of HM Customs and Excise.
UKBA estimate that from 2001 to 2008 these vessels undertook a total of 21,900 operational hours per year.
Due to fluctuations in the number of vessels in operation, and operating patterns, we do not have a record of operational hours undertaken before this date.