KATO Unitrack is what you're looking for. Two outlets that I know stock it are M G Sharp of Sheffield (website is at http://www.mgsharp.com/ ) and the Model Railshop at Abingdon (also known as Osborns's - website http://www.mrsecure.com/index.php ). If Osborn's don't show it on their webpage, an email will get a prompt reply telling you what the stock situation is. Being a Japanese product, the availabliity of this track is variable.
I have bought two of the track packs, K1 oval set and K2 electric turnout set, which allows me to set up a temparary running track on the dining room table so I can set my locos running occasionally. (SWMBO actually likes this because it means no mess!) The KATO points (turnouts) seem expensive but don't forget they have a point mptor built in.
Th M G Sharp webpage has a downloadable datasheet on KATO Unitrack which you will find very useful.
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