Since about August last year the spouse visas that have been issued have been valid for 27 months instead of 24 months.
You may be able to get away with applying for ILR in October instead of having to apply for FLR first - you need to to phone the HO up nearer the time. One thing to bear in mind is that they will hold your application (including your passport) until you have been in the country long enough before they start to process your application.