Be happy that you file got transferred . Now its all depends on how London want to process your application.my exact receiving date was Dec 17,2018 then I got mail for medical in Feb around 20th. After that i heard from them on august 1st,2019 that my file was tranfered to visa office london. My question is that how many more days are they going to take approx? some people are saying it will take more then 4 months or 6 months?