Re: Surrogacy.
Just a thought, say female A and male B can both produce the constituant parts to produce a baby but were for a medical reason unable to sucessfully carry the fertilised egg full term.
Female C agrees to become the 'host' and duly delivers of the child and hands it to the donors (A+B).
The baby, surely is to all intents and purposes the fruit of A&B, both genetically and any other way really.
It is hard to understand why the new parents cannot be given the same allowances as any other couple.
It is as Jimmy says very difficult to apply the rules, the only way I regret to say would appear to be a points system.
I would hate this to sound flippant and it is not meant to be but there has to be a difference in content, in say one or both donors or perhaps in rare cases even neither.
This yardstick would have to be a factor when determining the entitlement.