is the 1125 required? It’s a renewal, not an application for the rating.
You provide very little information to be specific. However, yes you do if the rating has lapsed for more than 5 years. This has been in place for many years, even before the EASA mess came into being, even for a national licence.
The form SRG1125 is very much designed to be for an initial application. You need to be creative. That is write across all the sections applicable to an initial application with the words 'NOT APPLICABLE' but of course complete just the sections regarding your personal details including your licence details. If you also hold a national licence ensure that the this is also updated. I don't know the charge for all of this. I'm not sure if you can write the words 'as applicable' in the payment form amount column any more.