You need to apply to hpc to register as physio in UK. They will ask you all your documents, about studies, etc, you can go on their site and find there all the papers u need to prepare.
It takes long to get register, about 6 month but I had a colegue at the clinic which was also portuguese, and they didn't ask her to complete any test of competence to get register.
So you need only to do the application and wait. Hopefully will be the same with your case.