Thanks again everyone, it is starting to sink in. It seems we are really going to have a second child :) The question is no longer if, but when.
pissedglitter, it's not a stupid question, how would you know if you don't have any experience of this?
Next we're coming to the matching stage, where our social worker looks to see if any of the children in 'our' local authority's care, who need adoption, would potentially fit in our family. She then shows us their profiles, and we can consider if we agree with her assessment or not. If we do, this child's SW reads the report that was written on us, and comes to visit us, and if she also agrees that it would be a good match, we can proceed to panel again, this time for officially matching us with the child. Then there are introductions, and quite soon afterwards the child moves in with us. After a certain period of time has elapsed, we can file for the adoption order, making the child part of our family legally, too.
We have also kind of been approved for foster-to-adopt and concurrency, which means a child may be placed with us in a fostering arrangement, and if it later turns out that the child needs to be adopted, the child would not have to move on to a new family, but could stay with us.
So yes, one major hurdle is behind us, but we may yet look back on it all and say how easy it all was in relation to what is yet to come.