Hi there, went into my local Tesco Extra this morning (Royston), and they had the OFFICIAL Plug and Play Kits for Xbox for a very reasonable £8.97. I noticed someone uploaded an "unofficial" plug and play kit for £8.97, but I can confirm that this was DEFINITELY an OFFICIAL kit. These plug and play kits seem to vary in price constantly, but thought this would definitely be useful for anyone who's going in for a weekly shop and fancies picking one up at the same time or whatever. Correctly labelled, thus I assuming it's nationwide.
This is the classic style (white, not black).