My advice would be encourage him to take up a career that you can do straight from school without a degree and make an earlier start in the working world.
Sadly everybody wants a degree these days so there aren't many good options around.
I'd say decide what you want to do. If there's a subject that you're really interested in, then go to university and study it. Or, if there's a career you're really interested in, find out if a degree makes sense for that career, and if so, go to a good university for the subject and study it, otherwise go straight into work.
People who say you should always just go to university are silly, and may end up encouraging people to waste their time spending three years doing stuff they're not interested in, but then people who say university is always a complete waste of time are also silly.
There's obviously the financial argument too, if you go to a good university, you earn a lot more money on average over your lifetime than someone who didn't go to university still. There isn't really a 'head start' when people coming out of university are getting £10k higher starting salaries and having faster career progression. I don't think that's a very good argument for just doing any old course though, even at a fancy university, but it obviously does sway some people.
It's also worth remembering that you can always do a degree later. You don't have quite the same experience maybe, but you do tend to have much more of an idea of why you are doing it. As a bonus, if you've been living independently for long enough, you get classified as independent from your parents, meaning you don't have to pay quite so much in tuition fees etc. as their income isn't taken into account.
i would suggest with the way things are going, you'll need to do a masters after the degree.
That is the norm in a few countries - we have loads of students from particular countries where you need a masters to do anything. The rumour about this is that the reason is that in several of those countries, it is pretty much possible to buy your first degree, so they are somewhat devalued, even for the unlucky kids who actually put in the work, which is sad. That doesn't seem to be the case here even at the worst universities. There are also several European countries where postgrad degrees are a large part of professional training, so lots of people have them, whereas in this country that kind of vocational training is usually something separate.
But I don't see it being the case in the UK, except for areas where it is really very competitive and a more specialised masters can be very useful, for example I seem to remember International Development & charity work people often have masters degrees, because it is a hard sector to get into, and having focused knowledge of a particular area is very useful for the work.
Joe