Hi,
Similar situation to yourself, I am a enrolled nurse which is a diploma, which was achieved in NZ and I have eight years experience in NZ.
Came here because Auss and NZ have a mutual agreement with nurses, and was told I would have to apply for a graduate course of which I had missed because you have to apply in June Feb and March, very confusing and there is no guarantee you will get on a course.
I have heard that a lot of UK nurses are coming out here and have to work as health care assistants, don't like to be the bearer of bad news, but I would keep trying maybe someone will give you a break.
As for myself I went back to NZ a couple of weeks ago and got a job straight away so going back, been here nine months and have no job.
But we are all different so hopefully you will have a more positive reaction.
Good luck.