 No one really seems to be able to tell me, I have to say, how big this collection is. What we do know is that it has something like 14 million books, then there are journals, newspapers, magazines, manuscripts, archives, sound and music, video, maps, patents, prints, stamps, photographs underpinned by a mix of the great founding collections. There are new kinds of archival collection coming in all the time, which push our boundaries. Here's Wendy Cope's personal collection, one of the biggest literary collections we've had. 15 storage boxes, we kind of know what to do with those 40,000 emails and word documents. And we've had to really keep pace to know what it means to collect and preserve material like that. We need to develop new skills to capture the operating systems that are already becoming defunct in front of our eyes. Every e-book, every e-journal and indeed every website within the UK domain is now collected here truly beginning to develop the idea of the library as the national memory in a way that future generations will recognise.