Registered Pharmacy Technicians in the NHS may be responsible for the training and development of Pharmacy Support Workers; Senior Pharmacy Support Workers and Pre-Registration Trainee Pharmacy Technicians. Further training and qualifications after initial registration enable them to perform this mentoring role. Pharmacy Technicians in the UK (as with other countries e.g. Canada) are now referred to by some as professionals, although Registered Pharmacists are obviously considered experts in the Pharmaceutical field and are subordinate to Pharmacists. The reference to pharmacy technicians as professionals has been subject to challenge.