"Prescription collection mix up"

A minor qualm in an otherwise satisfactory visit to the Royal Eye Unit at Kingston Hospital:

Upon being given my prescription the doctor told me 'you can get these medicines from the pharmacy within the hospital'. Unfortunately what he should have said is 'you HAVE to get these medicines from the pharmacy within the hospital.

I subsequently went home and dropped into my local pharmacy only to find out that I couldn't pick up my prescription. I then had to travel back to the hospital, thus losing, all in all, over an hour of my time. On top of the four hour waiting time to see a doctor in the first place.

I noticed later that yes, it is written across the top of the prescription letter, but you tend not to look that closely until you're collecting. It would be great if the doctors could stress this verbally to patients to prevent this happening to other people,