What exactly does this mean. Does it mean doing the CPL Single Engine syllabus and test again or PPL Single Engine syllabus test again or something else.
An EASA Licence does not expire, therefore there are no Renewal requirements.
class rating expired for more than three years...
It does not matter what Licence (PPL/CPL/ATPL) the Rating will be attached to, the Renewal requirements would be the same.
Should I apply for the EASA CPL before the single engine rating or first get the single engine rating revalidated and then apply for the EASA CPL.
I do not believe the CAA will issue an EASA Licence without at least one valid Class or Type Rating that can be attached to it - therefore pass the SEP Renewal LPC first.