Richie,
It's possible that a newly qualified captain may not be allowed to do CAT 3 or likewise a crew with the F/O in training. Also each pilot is responsible for maintaining currency by performing at least one practice Cat 3 autoland in the last 6 months - plus one in the sim. Sometimes it's forgotten or you can spend a month only going to Cat 1 capable airports or even normally Cat 3 capable airports/runways where the equipment is downgraded due to maintenance.
Schiphol, Amsterdam often has ILS's operating at less than CAT3 - and if the system is below a certain level of accuracy (published in notams) you are not allowed to do an autoland and therefore it is difficult to maintain currency.