I don’t have a physics degree
The basic requirements to train as a physics teacher are a physics A-level and a degree, preferably in physics or a related subject.
If you have a physics-rich degree (for example, engineering, biophysics, geophysics or a joint honours with physics), your application to train as a physics teacher will certainly be considered. The ITE tutors will look at your subject knowledge and decide whether you would benefit from a physics Subject Knowledge Enhancement course and what length.
It is possible to train as a physics teacher without a physics-related degree. Indeed, there are English graduates out there in schools today. If you can demonstrate relevant work experience, this will count in your favour, but you will have to clearly show why you want to teach physics and what background you have to back this up.