Congratulations with your superb 2017 results!
as of 2nd Jan 2018 access to US funds are being stamped on by EU regulations
same here. The argument used here is not MIFID, but that to protect investors the necessary documents have to be in the language of the country where the ETF is marketed.
This argument can not be used in the UK?
The situation is not totally clear yet, some brokers still allow you to buy US ETFs, other brokers have implemented a buy lock on those ETFs.
We have to see how it will develop. Indeed a position in BRK is now more attractive; BRK is not a packaged product like an ETF according to the rules.