This would suggest that the non-dom changes as proposed will take effect from 6 April 2017.You will be affected by these tax changes if you are a non-dom who has been resident in the UK for more than 15 out of the past 20 years.You do not need to tell us why you didn't claim sooner.

Today’s DVRs allow you to go back to any point of time of a football game or Game of Thrones episode, so you never have to miss a score or a Tyrion Lannister’s wise crack.
Shouldn’t your data recovery tools be able to do the same?
Do you know anyone who has been able to save age in life insurance?
If so, maybe you wonder what the heck they are talking about.
When Net App introduced snapshots they became a feature that every enterprise storage vendor needed to have.
Having established themselves as the standard for data recovery, replacing them now requires companies to start from scratch and reimagine this process from the ground up.
For our American non-dom clients, it is best to implement planning before 31 December 2017 as claiming foreign tax credits in 2017 is normally part of the planning.
If you are a Buzzacott client, we will be in contact with you in due course to discuss any tax planning opportunities.
Check your state pension age to check the date you may be entitled to start receiving Pension Credit.