Class 1 medical becoming a class 2?

[smithgd]

I've been loooking through JAR FCL3 but not found any info, so I was hoping someone could help me out?

I have a class 1 medical, as I under stand it that becomes a class 2 once it expires? Is this true?

Also since the class 2 is valid for 5 years does that mean I don't have to do/tell anyone until the 5 years is up when I book a class 2 renewal??

If I then decided at somepoint in the future to get a class 1 again, would I have to undergo the initial test or just the renewal test plus any ECGs/hearing bits that have elapsed?

Thanks
smithgd