@Royston Vasey.
A rather arrogant and ignorant post, if I may say so.
Nevertheless, I'm intrigued to understand your logic. What are the 'seat blockers' supposed to do exactly, make themselves unemployed so that someone else can have a go?
As to your comment regarding ambition. Not everyone sees their future in long haul or the middle east. And for those who want to stay in the UK, there's no real alternative at the moment. Where exactly should their ambition take them?
KT