“It is … not open to the local authority within proceedings to decline to identify the practicable services that it is able to provide to make each range of placement options and orders work in order to meet the risks identified by the court … If the local authority were able to decline to join with the court in the partnership endeavour of identifying the best solution to the problem, then there would be no purpose in having a judicial decision on the question raised by the application… It is only by such a process that the court is able to examine the welfare implications of each of the placement options before the court and the benefits and detriments of the same and the proportionality of the orders sought.”