woot yet another pyramid scheme...
write down your referrer and give £20, when he has enough referrer references he'll get his £300 item (provided the site owner doesn't scam everyone)
then you have to run around trying to get people to list you as their refferer, if you can get enough people to sign up then you'll get your (reduced cost!!!) goods...
As I said before Pyramid schemes are illegal, most are untrustworthy. although I guess if you only loose £20 some people might be tempted.
Just remeber, if it is a scam, and you've convinced 100 people to sign up then you are an accomplais to a crime.