First of all, a warning, I picked up a set of these speakers at my local Comet today for £14.99. Likely to be clearance stock (doesn't show up on website), there was around 6 of them left. I have no idea what the availability will be like at your local comet store.
Comes with a UK Adaptor (which is unfortunately a little heavy as most adaptors are), but can take 6 AAA batteries as well. I'm mentioning this because the review of them here, states that it doesn't come with an adaptor, but mines did- .http://www.goodgearguide.com.au/index.php/taxid;2136212636;pid;1335;pt;1
I had a look online and can't find many shops selling these (probably replaced with a newer model), but Amazon are selling them for £45.76, and another less reputable retailer has them for £35.
I'm happy with them, they look and sound better than you'd expect for £15. Hope you can find a set if you are interested.