Expect a few nose-related gesticulations as the most modern – and visible – addition to the National Maritime Museum opens its glitzy doors to the public this weekend. This glass:concrete extension – housing Voyagers, the story of Britain and the sea – is courtesy (well, £20million of it) of Israeli shipping billionaire Sammy Ofer (didn’t see that one coming, did you?) and is a simplistic, mostly elegant addition to the astonishing World Heritage Site over at Greenwhich (which includes Christopher Wren’s baroque Royal Naval College and Inigo Jones’s Queen’s House) – though it’s not close to being in their league, which is where most people will get a bit sniffy. But at least it’s not pastiche, so count your blessings. And BP/Snappy Snaps/KFC haven’t got hold of the rather lovely outdoor umbrellas yet – if they do, that’s when we’ll be calling in the guard.