tnm1.avn-websites.co.uk/

I think because my video is only set to 190px wide on my home page, the full screen icon is not accessible (hidden underneath the streaming bar). Is there anyway of making this clickable?

I am afraid not. Did you try another video provider?

Thanks for getting back to me... I couldn't find any decent ones for 2.5, can you recommend?

Check from the table here according to your video format:
www.joomlaworks.net/content/view/35/41/