Actually several questions:
1) How many people work with computers in the UK?  Either the majority
of their work is on computers, or at least 2 hours per day.  How many
computer workers are there in the world?

2) What are the UK and world market sizes, in terms of software
licenses sold and/or value, for Display Screen Equipment (DSE) health
and safety training and self-assessment software?

3) Who are the main companies in the DSE software market, and how are they doing?

References to the sources of any answers must be provided

Thanks
Phil