Small and loud don't usually mix but look at this list/link and list what you think what you might purchase. Also, please list websites and/or stores in your area. You will probably want active(powered speakers, depending on what you are hooking them up to.
PA speakers will play louder but the sound quality is usually lower.
What will you be hooking up to the speakers? And what will you be using them for?
AmazonUK:
http://www.amazon.co.uk/gp/search/r...618031&ie=UTF8&qid=1371995565&rnid=1045959031 Audio Engine are good speakers.
Avid M-Audio are also good speakers:
http://www.amazon.co.uk/Avid-M-Audi...e=UTF8&qid=1371996188&sr=1-1&keywords=m+audio
Happy listening, the Prisoner...