Mate call child maintenance. I had my son 3 days a week and they called it shared care. She got tax credits and child benefit whilst I used my money. You're not legally entitled to pay anything although she might be a cunt with access. I was paying her £250 a month till I was told I didn't have too. She also got increased tax credits cause wee man gets DLA. Now I get that and pisses her n fsm off