Don't agree with the Scottish proposal, if they didn't look good enough to be paid full wage, the Uni should have failed them on the course.
But, since when has £21588 been usury? How many other posts automatically move you up a pay scale every year? So after 5 years of scraping by you reach £31552. Apply for threshold (you have to be pretty bad not to get it) and that gives you a bump to the upper pay scale, usually stepping up every two years (not automatic, but usual), so in another 5 years you are at £36756. Add TLR (Teachin and learning responsibilty, basically some management role) and there's another £3k. Deputy head of a medium primary will be around £45K, head £55K+
Head of my daughters secondary is on £152254.
Now I know £22K won't go far if you're in an expensive part of the country, but the qualification is national, and respected abroad. At our primary all the last batch of newly qualified teachers have bought their own houses and drive newish cars and have loooooooong holidays.
As for there being so much work, I've always been amazed how schools, despite having a national curriculum, insist on reinventing not only the wheel, but the horse, cart, nut and bolt in lesson planning. There are masses of good quality off the shelf resources out there.