Whilst you can clearly afford to pay for your prescriptions for quite some time, clairson59, I can see your point.
Apparently 88% of prescription items are dispensed free of charge in England for various reasons. Those exempt include children under 16, pregnant women, people over 60, young people in full-time further education, people in receipt of certain benefits such as Jobseekers' Allowance (Income based) and people suffering from specific conditions, such as certain types of physical disability, diabetes, or epilepsy, for which they hold a valid exemption certificate.
Whilst I'm sure someone on Contribution based JSA who exceeds the savings threshold should be able to afford to shell out for quite a number of prescriptions, one could also say the same for some affluent over 60s or professional parents of young children.