To start with, all physiotherapists need to be registered with the Chartered Society of Physiotherapy (CSP) and the Healthcare Professions Council (HCPC). These organisations regulate and ensure that physiotherapists work to the highest standards and maintain their professional development.
Specialist physios should also have accreditations to their chosen speciality, e.g. hydrotherapy, acupuncture, paediatric, neurological, respiratory …
It is also a great idea to check their online reviews. Many companies, including TPC/3W, encourage clients to leave reviews and testimonials on how their treatment and experience has gone. It is obviously great to receive positive reviews, but sometimes it can be just as beneficial to receive constructive feedback.
Recommendations from friends and family are obviously a great way to find a good physiotherapist.