Ok, its not *quite* as simply as the title makes out, but its still prity straight forward.
Morrisons are running an offer to promote the new home draught beer that you can buy. To claim your free "keg", you just need to register on their website and invite 5 friends to the site through your link. There's no tie, you just have to register and invite others (if you wish).
If anyone could be kind enough to use my link to register, and then pass on their own link to whoever to claim their own free one, that would be amazing!
More than happy to put the next person's link once i've got my five and pass on the goodness
Cheers in advance