My undertansing is that they could request a top up if they were providing 3hrs care, but if for example
Fees= £20 for a 5hr session
Grant = £8 per session
They are not allowed to charge £12 for the 'other' 2.5hrs of the day. The max they can charge is £10. Does that make sense?
However, I need to clarify that, it may be something I read on here. Although I have just read a link which says that a minimum of 2.5hrs care must be provided, which implies they can't charge any extra for the 2.5hrs which the government pays for if it doesn't cover there published costs.