As part of an exercise to see if I can reclaim some tax, I went back through all the invoices I have for IT book purchases since 2002. It comes to £1234.61. 2003 seems to have been a good year for Computer Manuals where I managed to spend £470 with them.
I'm missing a batch of invoices from 2001-2002 and I know I spend a serious pile of dosh with them as I gaze across my lounge at the straining bookshelves.