"...We used to send apprentices..." When I worked in bars, long ago, I sent a bus boy for a bucket of steam. There was a tap on the ceiling in the staff crapper somebody, that wasn't me, had labeled as a "Steam Tap". The guy came back saying he couldn't find it. Told him to ask the manager to show him. Manager came by about a half hour later and said something to me about sex and travel. Sunday's were usually slow.
"...we're desperate to get young people into trades..." That's entirely due to the assorted manufacturers, like the car makers, etc, absolutely refusing to train anybody. That's not new either. They were told, repeatedly, 40 years ago, us Baby Boomers were going to retire one day. The companies all said "Training is not our job. It's the Government's job." Now, those same companies are whining. What they're not saying, and neither are the assorted social workers going on about things they know nothing of, is that they don't want a new guy. They want tradesmen with 5 to 10 years experience. And it's experience working, not volunteer experience.
And the Unions aren't any better. They think apprentices are taking jobs away from the other union plugs.