There are not a lot of nannies in North Wales. NannyPaye recently published a map showing where nannies are located and North and Mid Wales were areas where there were not a lot. So I can see that finding work could be tricky.
I'm self employed nanny for two families, I work mon-wed for one and thurs-fri for the other.
So that does not really fit with self employment, it is more like two jobs. You are missing out on employment rights by doing it through your own business and are running the risk that your clients just stop using you at any time.
I get on very well with the mum and I see her more like a friend
You are clouding the relationship, she is first and foremost a client of your business. If she is not sticking with the terms of your agreement then you need to consider if they are a client worth keeping.
she's looking for a new job which is full time
Yet you work 3 days for her, so what would she do for the other days? She may decide to get childcare for all 5 days.
I'm OFSTED reg
Ofsted do not register providers in Wales. So if you are Ofsted registered then she can not get help via that method. They could do through Childcare Vouchers if you registered with CSSIW.
about 2 months ago she wasn't sure she wanted to keep me on because she thought putting the boys in a nursery would be cheaper
Perhaps very tight on money and so aiming for the lowest cost care. I would have thought that nursery for 2 children would be a little cheaper than a nanny.
asked her today what her intentions are re my employment and she basically just said she'd let me know once she finds out... also we have a contract which was signed stating she'd give me a weeks notice if she was to let me go.
Yet you are self employed, so there is no contract of employment. Perhaps you mean Terms of Business. If she was to not stick to your business terms you could pursue her via small claims court but there would be costs involved so it may not be worth while.
You are able to look for more clients, or paid employment whenever you like, so no harm in looking for work, be that childcare or other.
it just feels as if she'll dump me whenever she feels like it.
Which is what your agreement allows - you have a 1 week notice period on your agreement. If you were an employee, then you may have a longer period such as a month. It still is not a lot but many jobs are not very secure, they can come to an end fairly quickly.
I was thinking of a nanny share with both families
No, don't do that as that would be employment and it will cost both families more as they will have to do payroll and pay employers NI which they currently are not doing. They should be doing that now but you claiming you are self employed is letting them get away with not doing that at present.
I have asked her in the past to give me a straight answer regarding my
employment but she always avoids the answer etc.
She does not have to do so given your agreement.
There is really nothing you can do except keep looking for work. I would look for paid employment, not new clients for your business, so you get a little more security. Finding work though can be hard in many areas.