Nail on the head. Schools are almost forcing the more able pupils to go down the Uni route, which leaves the less able ending up in the colleges "learning a trade", but lots don't even have the ability to do that, hence why the trades suffer so many no hopers, both in terms of not being able to complete their apprenticeships, or those "dodgy" tradespersons who ply their "trade" without the proper training/experience/qualifications, aka bodge it merchants.
Historically, people with manual skills have been respected, going right back to biblical times, and certainly through the middle ages and the industrial revolution. It's a pretty recent thing that tradies have been looked down upon as lesser beings because they didn't go to Uni!
The scrapping of the Polys, and the virtual scrapping of a world leading adult education sector did untold damage, and then Blair came along with his crazy 50% target! It's all served to down-grade the trades as a decent profession and allowed the no hopers and con merchants to get a foot hold!
I remember my school days in the early 80s. We had a lad who was the stereotypical "top of the class" and it was kind of assumed he'd be one of the few (in those days it was a few who went to Uni), but he surprised everyone by leaving school with a clutch of top grades at GCE to be trained up as a plumber by his father. He got his own little van as an 18th birthday present and within a few years had taken over his father's customer base. He retired when he was 50 and lives in a million pound house in the "posh" part of our town, driving around in his Porsche. That wasn't earned ripping people off nor employing underpaid staff etc - he remained a sole trader just as his father was. He was just a hard worker, and because he was actually reliable, turned up on time, etc., he got massive repeat business and never needed to advertise. Neither his nor his father's vans were ever even sign-written. We used him once to replace our boiler and radiators when we moved into our home and we've never experienced a tradesman who was so ridiculously good - he cleaned, tidied and vacuumed at end of every day, and even painted the copper pipes he'd installed and built a lovely wooden frame and door to enclose the boiler - well and truly above and beyond and his quote was comparable with other local firms we'd asked to quote!