Here in the Frozen North, checks are done every 6 months regarding proficiency. Tape checks are also done "without notice" to ensure correct phraseology is being used. A KVT (knowledge verification test) is also required every 12 months to ensure the book smarts are still there as well.
We also undertake "refresher" training, which is like the UK TRUCE program, involving classroom discussion/presentation as well as simulation (radar failure procedures, lost aircraft etc......).