1. What is an "Optician"
Non-medical eye specialist. Trained at university and then in practice through a pre-reg program.
2. What is an "Optomotrist"
Eye doctor.
3. Who are the most qualified people within a practise - and why do you think that is?
Depends on the practice. If there is an eye doctor there it would be him, but I suspect most practices simply have opticians and refer to hospitals for anything serious.
4. Which opticians do you frequent, and why?
None. My brother is a newly qualified optician, so he checks my eyes when I see him.