The media bar / videos in this section were working http://umcwales.com/#recent-projects ( the pink box with vids n ), however now when you click on them they are displaying this error:
Not Found
The requested URL /undefined was not found on this server.
My guess is that this attribute is set somewhere using JavaScript and that there is an error either with this code, or including the code which is responsible for this.
If I were you, I would make a bare bones page with one FancyBox video on it (which hopefully will then work), and compare this with your current page.
If you can do this and post a link to a barebones page with a working FancyBox video on it, I don’t mind taking a look.
So, I had a bit of time to look at your page and I’ve found the problem.
The videos have URLs like this: http://www.youtube.com/watch?feature=endscreen&NR=1&v=bxDyomFVXqo
What you need to do is to remove the feature=endscreen&NR=1& part for each URL, so you are left with http://www.youtube.com/watch?v=bxDyomFVXqo
Also, you have not closed any of these links.
Here’s the revised code. Copy and paste this into your HTML file and things should work as expected.
The only video I couldn’t get to work was the final one (http://youtu.be/sBOAzy24JGE), but I’m guessing this is a problem with the URL, as well.