TSO is a strange beast; formerly HMSO (Her Majestys Stationery Office), now the Office of Public Sector Information – it is the official publishing arm for the UK Government. Everything from Government papers, reports of debates in Parliament to ITIL, Prince and other documents are published.
The TSO bookshop is a veritable hideout of really specialist, non-overlapping information.
I was buying books on ITIL – the IT Infrastructure Library – for my team. Useful and required reading in todays IT world.