Foreign pension lump sum , tax pre April 2017 and post April 2017

My foreign pension (Swiss Life Luxembourg) contributions buy my employer commenced in 2008 and had ROPS status, that status discontinued in 2017 following the intro of the FA 2017 qualification criteria. I was NOT advised of this status change and /or the tax implications. I am scheduled to receive a lump sum of the whole amount, are there two different tax liabilities, pre and post April 2017.

Hi Harvey57 Jackiboy57,
Please refer to guidance at EIM75500 - The taxation of pension income: foreign pensions.
Thank you.