“A welfare analysis is a requirement in any decision about a child's upbringing. The sophistication of that analysis will depend on the facts of the case. Each realistic option for the welfare of a child should be validly considered on its own internal merits (i.e. an analysis of the welfare factors relating to each option should be undertaken). That prevents one option (often in a relocation case the proposals from the absent or 'left behind' parent) from being sidelined in a linear analysis. Not only is it necessary to consider both parents' proposals on their own merits and by reference to what the child has to say but it is also necessary to consider the options side by side in a comparative evaluation. A proposal that may have some but no particular merit on its own may still be better than the only other alternative which is worse.”