I bought a Madcatz RGB scart adapter from my local PCWorld the other day. It has 4 RGB scart sockets, it`s switchable, and the lead to the tv is built into it. It`s costs £20, so it`s more expensive than the argos model, the picture quality is excellent, definately RGB. Worth considering if you want more than 3 sockets, but don`t want to daisy-chain the argos blocks.
Here`s a link that will hopefully work, it`s very long so if it doesn`t work goto www.pcworld.co.uk and search for scart or try this link
Pete