The architects, Grimshaw, have taken something delicate and beautiful and surrounded it with a building that looks like a 1980s bus station. Clumsy and ineptly detailed, their new glass greenhouse around the Cutty Sark totally ruins her thrilling lines, obscures much of her exquisite gilding and cynically forces anyone who actually wants to see her to pay their £12 and go inside. — blogs.telegraph.co.uk

There were other strong contenders, but the 2011 Carbuncle Cup for Britain's "ugliest new building" has been awarded to the £600m MediaCityUK. This concatenation of anaemic buildings is the controversial new regional headquarters of the BBC, and home to the media studies faculty of Salford University. — guardian.co.uk