Many universities do not consider physiotherapy as an adequate medicine undergraduate degree - as it is not a biological science in all honesty, it is a healthcare degree. Your undergraduate degree will not really be considered greatly due to the fact you will cover very little cellular biology, biochemistry or physiology. Physiotherapy focuses upon anatomy and handling injuries/mobility/etc - not on any kind of microscopic level.
Some GEP medical programs accept healthcare workers (Leicester is one) for instance, but many do not (Warwick, Barts) as they require biological science degrees. Also many undergraduate degree medical programs require a biological science studied at undergraduate for your A-level results to be "ignored" (of course they're never truly ignored) - for instance without a biological science Kings require BB in Biology and Chemistry, Barts require AB in Biology and Chemistry.
I'd think long and hard about studying physiotherapy as a means to get into medicine.