Hi Martin,
I'm in the same boat as you - just coming to the end of my first degree and without a doubt want to do physiotherapy!
I recently had an interview for the MSc pre registration course at KCL. I got asked a lot of questions about my current degree and how I could relate the skills I had gained from it to physiotherapy. I also got questions about if I thought I could cope with the pace of the course and one that threw me a bit at the time was what I thought the biggest challenge was to physiotherapists in current healthcare and how I could contribute to this. Also got questions on how I would cope with conflict in a team situation and the expected ones of why physiotherapy and what I thought I could offer to the profession.
I know I was a bit unsure of what to expect going into my interview so hope they help you out with preparing a bit - I absolutely know the feeling of really wanting to study physio so good luck with it all and from what you put above you sound like your in a really strong position.
Elle