Pandalet . you are right that you now only have to do one of the light turbines to cover all the ones that you have had an initial rating on subject to having done a handful ( 5?) hrs in previous 12 months. I have just renewed my 206 rating which now covers me for the year on the AS350 , MD 500 and gazelle. Having said that if you only fly privately then fly on faa licence and you dont need to bother with any ratings at all . ( i think including night rating as its all incl )