The only thing needed to keep the CAA happy is to do a revalidation (if still valid) or renewal (if expired). If it is a ME IR you would have to revalidate/renew the ME rating as well. The whole thing is called a LPC (licence proficiency check).. .. .Whether that makes you a happy instrument pilot is a different issue..... .. .Feel free to contact me directly if you have additional questions. .. .Cheers