I know it is very hard when you give up your time to interview parents especially if it is at the weekend, and then you don't hear anything back.
I would prefer a simple thank you for your time, but we have made other arrangements, than nothing.
i recently spent 3 hours with a couple and baby on a Saturday and the mum was very keen, talking deposits etc, desperate for a place, requested references which are excellent, verbal ones too, so could get a feel from ex -parents, and then nothing.
I emailed and said could I have some feedback, but no reply and I know she is still advertising on childcare.co.uk
Childminders accept that families look at more than one childminder and it is personal choice, but politeness and courtesy cost nothing.
I have as my name says ben minding a long time, and still find it a little disappointing and upsetting, but then if they can't be polite, do you want them as a client?
Good luck, there are great families out there, it may take a while, but wit for the right family, I 'd rather wait a while, seeing several families than take on the wrong family.