I'm doing the opposite move - coming from UK to Canada for a better life!
Agenda for change pay scales 2 17/18 - Hourly - NHS Employers
gives you the hourly pay scales, as you can see it goes from 11.32 to 14.70 for Band 5, depending on your skills/experience, so from what you say, I would have thought you would start on point 18/19, so around 12 ph. Most places don't even look at the hourly figure, you're going to be doing 37.5hrs per week / 144 per month. Don't forget on top of this, you get your increments for weekend / unsocial hours as well.
Not sure what you mean by private - if you're an ED nurse (like me!) then you're going to be in the NHS. If you mean working for a private agency, contracted to the NHS, then yes theres plenty of those. Depending on wether you set up your own company or not, you can get GBP25-40 per hour depending on day/time (might be a little lower in N Ireland). Some peoiple work full time for the agency, some do a few shifts just to supplement pay, or save/pay for something special.
A few caveats -
1 Work is not guaranteed, and may be cancelled at the last minute
2 Not eligible for holiday pay/sick pay etc (but most reputable agencies will have some scheme in place)
3 Training and Education becomes your responsibility, most agencies do basic BLS, but you will have to pay for everything else.
Let me know if I can give you any more help.