Do I have the right to take a break?

Yes.

The DSE Regulations say that employers 'should allow their employees time to take breaks away from the workstation and telephone, and the accompanying mental and physical stresses'.

Both the length of break times and their frequency are equally important. 'Breaks' can range from doing other non-computer tasks to completely stopping work. The DSE Regulations do not define 'break time' in terms of minutes every hour.