How many kids have you got? I think on the whole, if you have more children, it can be cheaper to get a nanny than pay for nursery, but if it’s just one child then a nursery would be cheaper. In my area, a full day at nursery is around £45. That is for up to 10 hours. If you paid a nanny say £8 per hour and wanted them for 10 hours a day, it’s nearly double! But if you have 2 or 3 kids, then it starts to look more attractive. It depends also on how flexible you want them to be. You might not want to pay £45 for a full day at nursery when you only need them looking after between 9 and 3 for example.
And don’t worry about it sounds ‘poncy’ haha! Just say the childminder is coming over if you’re that bothered.