The ANA or old pre-vet nursing, theoretically should be on minimum wage. However, an employer can pay you less than the minimum wage for the first year of your employment, as a legal loop hole allows for this first year of employment as a trainee year and therefore exempt.
As for how much do you get paid for year 1 VN or year 2 VN, well that is up to the employer. Again once you have worked for a year, you will be on mimimum wage or higher. Some employers choose to keep student nurses on the minimum wage, as they have to pay for your education, exam fees and paid time off to study in addition to holidays. Some choose to raise the salary as each year has passed as an incentive. Some may give higher/lower salaries depending on work history/experience/age ect.
Please note this is not the NHS there are no grades or entitlements, you are working for a private business, and ultimately it is up to them what they pay you.
However, as a guide a qualified nurse will be on a minimum of £14,000 and locum nurse usually earn around £10 an hour.
Hope this answers your question!
Regards