Except that they are designed to work more complex locking mechanisms with
several bolts and such like linked to the lock, mine has about seven.


They are for universal use:
http://www.screwfix.com/app/sfd/cat/...00224&ts=18279

Nice features are the interchangability of barrels in a couple of
minutes between key/key and turn/key, the ready replacement after loss
of a key or change of owner and the availability of controlled key
profles for high security applications (keys can only be supplied
against documentation, no high st key copying).

I like the feel of old chubb keys/deadlocks - but europrofile is
superior for the above reasons.