I refer to third parties as the case here is one where two parties may be in agreement and are willing to or have obtained what they need to undertake their choice but where the final say is up to a third party and out of their control.

Possibly like paying for your driving and road fund licence but finding out that licensing the road needed to be a choice exercised by a third party and a licenced obtained by someone them before you were allowed to drive on it.

I really think you have excelled yourself this time Roger.