Nanny wants £5 p/h gross?!

[TheDetective]

Hi, I'm new to looking at the option of nannies. I've always used nursery/childminder if I've needed childcare.
However I'm now a single parent working unsociable hours, and realistically I'm in need of a nanny.
I've used the childcare.co.uk site to start my search. One lady I contacted sounds ideal. She is coming for an informal chat next week.
We discussed pay, or rather, she brought up the matter. She said she charges £5 per hour, gross. She said she would usually charge per child, but as I am needing her for 2 set days per week from 7am-8.30pm as a long term arrangement that she would simply charge me the £5 p/h.
I thought minimum wage was increasing to £7.20 in April? Shouldn't I be paying that? If she has set the rate, is that allowed? I have no idea really.
Any kind advice would be appreciated (please bear in mind I'm new to this option, and I am an NHS healthcare professinal - not on mega wages!).

That's a crazy low hourly rate for a nanny and I'd be a little worried about that tbh. I think you get what you pay for on the whole. We pay £13 per hour gross.

Curious to hear the update!

I would ensure everything is contractual. If she is a Childminder, ensure she is Registered. If not, if something goes wrong, be it on your own head.
Remember, this is your child and I never understand why people pay more to have their dog walked?