Bing, it's the MOD, the hull is maybe 13 years old, but they probably filled it with surplus junk Sir Walter Raleigh would recognise.
Having been on her sister ship I'd say they hid any cost cutting rather well, it's a significantly cushier number than one of his gran's boats. Of course it's built to merchant shipping regulations so they can't cram the accomodation in like Pusser would for starters.