Overseas Pension - Singapore CPF

Hi Officer, I was a singapore resident and had my CPF savings in Singapore. I have got some funds accumulate April 2017. But I did not pay any additional funds to my CPF account. However I have been receiving interest on my savings for the past 7 years. As UK started to tax the pensions from April 2017, as per the thread seen earlier, the tax will be levied for the amount accrued from the year April 2017 and not for the prinicipal amount before April 2017. Please assist.

Hi SK,
Please refer to Article 11 of the tax treaty:
UK/SINGAPORE DOUBLE TAXATION AGREEMENT
Thank you.