What on earth makes you think after six months you'd be kept on rather than replaced by the next batch willing to work for sector pay only?
Sure. There will be a requirement to replace the odd person who has lost their medical, life or who has retired. Having a period of flexi wings on your CV might put you at the top of the application pile for sure.
But there is no job at the end of the 6 month of summer. Implied, hoped-for or otherwise.
This is summer-only work experience..
WWW