Yesterday I finally got around to climbing over the roof of the O2, and had hoped to be able to get a clear shot of Canary Wharf, where I took my last blog photo, but there was an ugly hotel in the way, and before too long there will be lots more tall buildings to spoil the view, so if this has been on your list too, do it sooner rather than later.  Here's the link: theo2.co.uk/do-more-at-the-o2/up-at-the-o2.  And look out for Morag Myerscough's Colourblock Cranes, an eye-catching art project that will turn out to be just as ephemeral as the London skyline.