I would talk with your daughters mother and find out what she says. Do you have a legal statement from a court to have to pay CM? If you don't, then talk to the childs mother and ask her what she needs for her.
It might be �25 per week, it might be �50, its not easy for me to say
Under the new method the basis for calculating maintenance has been simplified, with a fixed percentage of the non-resident parents net income being taken, from 15% for one child, 20% for two, and 25% for three or more. The maintenance was also reduced if the non-resident parent had children in their current family, reducing the payment by 15% if they had one, 20% if they had two, and 25% for three or more