Think it would probably be a mixture of having money, university, knowing someone to get an in the industry or the collection of all three.
That's really not necessarily true at all. Having money has no real effect at all, and while the other two may help, they're not actually necessary as such, as it's entirely possible to get into the industry without either. I'm not rich, didn't go to uni and didn't really know anyone in the biz when I broke in, and it didn't stop me (and just to demonstrate that I'm not some wannabe -
here's my credit list). I got in by doing good work and posting it on the internet; the web is an incredible medium for getting your work and name out there, so Alex here has the right idea by posting his stuff on youtube.
Having said that, the brutal truth is that if you want to work behind the camera or as a presenter, you're going to need to work on your skills in both areas, as your camera work in the clip you posted has some problems, and your presentation could be better. But don't be discouraged, as we all started somewhere and you can easily improve on these with guidance and practice.
The best way to break into these areas of work is actually by interning, or, as we call it in the film industry, being a runner on-set. If you keep an eye out in London trade rags, you'll find job postings for runners. It's unlikely that you'll immediately be able to work in your specific area of interest (wildlife documentaries) but any set experience counts in the long run. And even though I said about that those three things aren't necessary, knowing someone in this particular area of the field would definitely help. Hang around in bars in London's Soho after work hours and you're pretty much guaranteed to meet people involved in this kind of work. You can also keep an eye on the websites for British production studios, as they'll often post up ads for runners. Hitting up post production studios (even though you want to work in production as opposed to post) wouldn't be a bad idea either, as it'd still allow you to build a network of contacts of the right people - especially if you work in a post studio involved in TV commercials.
Lastly, you should put together a showreel for yourself. This is a clip, usually between one and a half to two minutes long, showing all of your best work. This is your key to landing work once you're actually in touch with the right people.
