(1) University of Glasgow, Kelvin Building, Glasgow G12 8QQ, Scotland.
(2) CERN, Geneva 23, Switzerland,
(3) National e-Science Centre, Edinburgh - EH8 9AA, UK,
(4) Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK,
(5) Dept. Physics, Imperial College, London SW7 2AZ,
(6) STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK,
(7) Dept. Physics, Lancaster University, Lancaster LA1 4YB, UK,
(8) Dept. Physics, Queen Mary, University of London, London E1 4NS, UK
The startup of the Large Hadron Collider (LHC) at CERN, Geneva presents a huge challenge in processing and analysing the vast amounts of scientific data that will be produced. The architecture of the worldwide Grid that will handle 15PB of particle physics data annually from this machine is based on a hierarchical tiered structure. We describe the development of the UK component (GridPP) of this Grid from a prototype system to a full exploitation Grid for real data analysis. This includes the physical infrastructure, the deployment of middleware, operational experience and the initial exploitation by the major LHC experiments.