Hi Donmakaveli,
I included my spouse details at around 7 months after our wedding, we both did our medicals around Oct 2015. We though all we need to do is to wait for our PPR mail. We have been waiting since Oct 2015 only for us to receive a mail from AVO stating that we need to include my spouse IELTS test result. I hurriedly registered her and she took the test last Saturday in Ibadan. Just my opinion though!, maybe you should register and have your spouse take the IELTS test just in case. If We had included my wife's IELTS test result, maybe the last mail from AVO would have been a PPR mail. Now I have to wait another 2 weeks to get her result and 3 days to ensure the hard-copy is received by AVO via courier. Once again this is my opinion based on my experience, yours may be different but its good to be on the safe side.