As long as you get your application in before the January 15th or whatever it is deadline then you will be given equal consideration as those who have submitted theirs now. When I applied, I put mine in in early January as it was a very much last minute decision to apply, and I was successful.
This leads onto the point about delaying your application until you have work experience. I sent mine off having not done any work experience, but I knew that I had some in the pipeline. This wasn't guaranteed, and luckily it came off, but had it not, it wouldn't have been that hard to blag it in the interview. What the interviewers want to see is that you have a good understanding of what physio is, what they do, and that you want to follow that career. Having sat on interview panels the past two years for undergraduate physio, we didn't have a clue what was on your UCAS application. You could have told us that you had spent the last 10 years working as a senior physio and we wouldn't have had any way of knowing otherwise. I believe that some applications are checked to confirm the work experience, but my point is that I wouldn't delay your application just for this. You could put something generic such as I have shadowed physiotherapists and observed the many roles that they fulfil. You are not stating an environment, a place or a time that you did the experience, and this therefore gives you lots of time after the UCAS deadline to get something sorted out. I'm not suggesting you lie, I'm just saying that you can be a bit vague and it's highly unlikely you will get pulled up on it.