What do you do now? Is there a demand for CS skills at the LHC, and was it a fulfilling place to work in general? Presumably you lived in the UK that whole time?
There is a huge demand for CS skills of all kinds. CERN has one of the largest SCADA installations in the world, runs its own internet exchange point, operates a network of computing centers with a million cpu and hundreds of PB of data, and maintains many many millions of lines of code of specialized software, just to give you an idea.
It is a fantastic place to work, the level of expertise and dedication among the people there (scientists and engineers alike) is very very high.