I was able to find the form to apply for the exemption, but it didn't give any details of what conditions qualify, and if you need to apply for it ahead of your visa application/how far in advance. I'm probably just not searching for the right terms, but can anyone point me towards the information needed to get an exemption?
I apply for ILR in October so have a few months to sort it out. Chances of me passing the test are pretty slim at the moment because of my health.