Im not sure if you've already found out but PTs in the UK are regulated by the Health Professions Council (HPC). Im not a PT but Im registered with HPC. You would want to get onto the register to practice as a PT in the UK.
Yes, one of the requirements for registration is to take an English proficiency test and one of them is IELTS. Just take a look at the website. They have the details that you need. You may have already found out about this but if not and unsure of things, I'd be glad to assist.
