Hundreds of fans were at Waterstone's flagship bookstore in central London today to catch the band signing copies of 'U2 by U2'.

Great to see so many U2.Com subscribers in store and meeting the band. And big congratulations to those who began queuing yesterday evening - and slept out in the rain - to make sure they got to meet the band and got their books personally dedicated.

Waterstones shut the store for the morning and the third floor was rammed with fans from all over the UK - as well as Europe, South America, India and New Zealand.

The band showed up at midday - to be met by a battery of photographers and camera crews - and began a marathon two-hour book signing which lasted well into the afternoon.

Tomorrow they're in Dublin for another signing and later we'll be carrying a fuller report of today's signing - and more photos.