I think it depends on where you live.
My last one (in Winchester) was £3.60 an hour, no meals. My new one (in Wiltshire) is £3.50 an hour all meals included. If you're in London, it's probably more expensive. Also, find out if you need to pay when you take your child out of childminder's care, even though the childminder is still available (eg you go on holiday) and on bank holidays. You shouldn't have to pay if your childminder is sick or on holiday or looking after their own sick child.
We pay £20 per day for 8a.m.-5p.m. for DD during the school hols. This includes a homemade, cooked lunch with pudding and drinks and snacks. We're in the north-west though so I think this might be why it's cheaper!
£2.50/hour, including lunch but excluding nappies. This is in Glasgow.
Before he started eating "ordinary" meals, (ie while he was weaning) I sent lunch in, as she's more like a nursery in that there are 3 that run it (her, her mother and MIL), so she wasn't able to customise food per child.
I also send in an extra wee bottle of milk, for his afternoon nap. I suspect he doesn't need it anymore - but it is part of his routine.
We pay for bank holidays and when we go on holiday, but not when she is shut for her own holidays - which is just one day in November (they have a girls' weekend away) and the fortnight over Christmas. Because she always has cover, she's never shut otherwise, as they take it in turns to go on holiday.