No!
Once a child is adopted they are legally the child of the adoptive parents. The only way that child could be a step-child is if the adoptive parents divorce and the custodial parent re-marries. Then the child becomes a step-child to the new parent.
If the mother and child (the stepchild) are domiciled outside the UK then no.
You no longer have a legal relationship to a step-child from a previous marriage.
no
If the child is in foster care you pay but not if the child is adopted. Then the child have new parents who are responsible for him/her.
No, once a child is adopted, the original parent or parents have no more rights to the child. This also means that child support is not required.
I think you mean "adopted child" and the answer is, yes.
Yes but he would still be responsible for child support unless the child is adopted by another adult willing to take legal responsibility for the child.Yes but he would still be responsible for child support unless the child is adopted by another adult willing to take legal responsibility for the child.Yes but he would still be responsible for child support unless the child is adopted by another adult willing to take legal responsibility for the child.Yes but he would still be responsible for child support unless the child is adopted by another adult willing to take legal responsibility for the child.
... to pay child support? Yes, unless the child is adopted.
No
He will still have to pay support until/unless the child is adopted.
Not from the parent that is losing parental rights.
Yes. Only of the child is adopted can you get out of paying child support.