I do think you should watch it from the beginning.
I use a download utility called bittorrent, you can get it at
www.bittorrent.com, then go to
www.isohunt.com, you can download the entire series under the name of Spooks.
I often download things from there that are not even aired here in the US. I am starved for more British programming with this lack of new programming here in the states.