I discovered this last year and it proved to be really lovely and straightforward to play. Not only is it lovely to strum in front of the fire, it also is useful to have up your sleeve if the soloist breaks a string etc (as happened last year)
Freddy is an absolutely lovely guy too, subscribe to his channel and send him a nice festive message folks!
http://www.youtube.com/watch?v=ReNh_qqU5WI 8)