The immigration health surcharge will be increasing from 08th January 2019. The increased fee will be £400, doubled from the previous £200 for each year of the visa duration applied. There is a lower rate for students and Tier 5 Youth mobility workers which is £300; again doubled from the previous £150.
The draft order was passed further to a final parliament approval on 28th November 2018 and will impact all applications made on or after 08th January 2018. There is however no official statement from Home Office or Health Department, but various sites including freemovement.org.uk has reported this on the basis of good authority.