"A registered nanny/childminder is not going to look after children for 4 hours every two weeks. They want regular work."
A you're wrong - many take on extra ad hoc work if it fits their schedule
B I suspect the real reason is it would cost you more - what are you paying her?
"I’m not going to get into how much I pay her as people will be debating if it’s too much/too little." That strongly suggests to me nowhere near enough. It DOES matter because it shows if you value her work or not.
"and more per hour than when she worked at the nursery" where she had more space and support.
Also as you mention bottles that suggests at least one of the children is still a baby. That's very demanding. How old are youngest two? Does she have all 5 at times? You answered yes - Is she paid extra if so? (She should be - regardless of them being asleep it's extra responsibility)
"Of course it’s relevant.
Chuck her a £5/hour and she’s basically just keeping you from getting charged with neglect for leaving kids unattended.
Pay her a reasonable rate and suddenly she is doing a job where rules and boundaries would be appropriate." Exactly - very well put!
"She used to work at the kids nursery so is qualified.
Qualified/experienced in a DIFFERENT environment where she's better protected by employment law, had support from MORE experienced and BETTER qualified staff.
No calling the difference between babysitting and child care is not pedantry. In the U.K. Babysitting is generally understood to be evening work that is undemanding as the children are mostly sleeping/winding down. Childcare is during waking hours and requires more energy, effort and skill. To say otherwise is disrespectful to the many excellent nannies and childminders we have in the uk.
Good childcare and babysitters are VERY hard to find.
If bottles are needing to be made up wouldn't you be doing that whether she was staying home or not? Or is she expected to do that? Car seats are usually quite easy to do these days so she could do that. Boyfriends - I don't have a problem for this in the evenings it gets boring and it's nice to have company but in the daytime it could be too distracting. Do you like the boyfriend? Do the kids?
"Jeeze did no one ever do babysitting for some extra cash when they were younger?"
Been looking after younger children since I was 14. Started with babysitting later as a nanny and childminder.
Babysitting was always well paid and snacks and drinks included. Some families didn't mind me having a friend or boyfriend keep me company some did.
Daytime occasional childcare was also decent pay (more than babysitting fees) and not restricted to the house.
Pay higher if babies and/or more than 3 children being cared for.
"If someone was awkward or she felt there was issues she'd have no problems replacing them with another family." Precisely - good babysitters that the children like are like gold dust! I've also been a Lp for 15 years and had family friends as babysitters. I personally wasn't comfortable with boyfriends especially when dd was pre-verbal (I'm a csa survivor) but paid well and made sure the sitters were comfortable (snacks, drinks, bed provided if they were staying over).