If you're intending delaying your UK arrival until sometime in October you may want to reconsider
the implications.
Your Visa is valid until February 2018
Means you'd need to apply for your FLR(M) during February 2018
That's earlier by 2 months than the regular half-way mark of 30 months UK residency.
Your FLR(M) will expire 30 months from February 2018 which means expiration August 2020
At that time instead of being eligible for ILR, you'll need to bear the extra cost of another FLR(M)application to see you through to October 2020
There are other possible permutations of FLR(M) visa applications, but the bottom line is that delaying your UK entry by the time you suggest will cost significant more.
As always, it just come down to available budget but better to make those decisions in the knowledge the future cost hits. (bear in mind this future costs will be higher than current costs)