Hi, I received my 1st spouse visa in June 2013 but due to family reasons, only arrived in UK on that visa in April 2014. This visa expired in Mar 2016 so I renewed it and now it's due to expire in October 2018.
Not until April 2019 due to your delayed arrival in the UK. You will have to apply for another FLR(M) extension to make up the shortfall.
(Casa, not CR001) Please don't send me PMs asking for immigration advice on posts that are on the open forum. If I haven't responded there, it's because I don't have the answer. I'm a moderator, not a legal professional.