For some reason, all I get is a popup asking for a subscription plan...but there are other sources out there. (I've got one, I just would have to find it again.)
Generally speaking - though this is in the US and not the UK, but I would imagine it would be similar over there - the older crowd tends to show up more on election night than the young people. This is partly because the Boomer generation - those in their 50s to 70s, now - was really the last generation that was able to come of age in an era where political participation was really inculcated and, more importantly, mattered. Here in the US, the first Boomers came of age during the mid-60s, where political protest and campaigning accomplished things aside from changing the label on the face presented to the nation.
There's a guy I listen to - Kyle Kulinski - who notes that one of the major reasons the current presidential election in the US has been so radically different from past elections is that, unlike past cycles, this time the millennials are getting involved. Things are changing because young people A: are fed up of a system that's been programmed against them from the start, B: have a candidate (whether you think it's Trump or Sanders) who represents them; and C: are looking at the mess that's being left for them by their parents and going "NOPE! Not having any of that."
The low turnout for young voters has traditionally been attributed to things like 'political apathy,' or ignorance, but those could not be true. A lot of my millennial friends (I have a lot of them, since I am one) are finally excited about this election because they're talking about things like universal healthcare, universal education, spending more to fix problems at home rather than abroad. The universal education thing in particular is big - there was an article I'll have to look up again, but one of the things it said that kept the young crowd disinterested was that we were told, in effect, "there's no money to support you going to college, which we've told you all your life you need," and then hearing the people on the political circuit talking about spending more on Medicare and Social Security.
In short, you want young people to vote? Start talking about issues that matter to them - though that would require getting off your arse and actually speaking to them.