i agree with Rod. The FAA, for example, recommends only to do it with CFI's. But if you only fly with CFI's on your Biannual review (or whenever you UK guys have your reviews), then you will probably be out of luck when it actually does happen. Just when you do it, make sure you operate the engine correctly. You know, clean out the engine every 500 feet (if you idle to long, and then suddenly apply full power on the go around, your engine could be 'stuck'). Make sure carb heat is on (since your on reduced power setting).