Trinity B1.1 expires in two months

Hi I am about to apply for citizenship. I passed GESE Grade 5 (B1) on 4th of August 2018 but than I had some health problems and I am just about to apply for citizenship.
If I apply this month do I need to take another test? Or the certificate is valid at the time if application but will expire in two months or so?
I know if I apply I cant book to give my biometrics yet but the .gov site says that I can do that later.

Your date of application is when you submit/pay online - not the biometrics appointment.
If your certificate is valid at the time of application there's no issue or need to take a new test.