Insurance for hospital in patient daily reimbursement

I have an insurance policy to pay monthly premium for 10 years in Hong Kong. This is for cover a daily fix daily amount reimbursement if I need to stay in a hospital in patient. When the policy mature, I can take back 83.34% of my total premium contribution. There is no gain arisen but a 16.66% spent actually. My question is when the policy matured and I received the one off money to my Hong Kong bank account, do I need to claim to my UK tax account somehow, e.g. Self Assessment?

Hi,
No.  As you will have already paid tax on the payments you make and there will be no gain arising from the policy marturing, there is nothing to declare.
Thank you.

Do I need to keep any document to prove the income has no gain arised? Will I be queried by HMRC at some point later to provide any proof?

Hi,
Yes, you need to keep evidence in the event that you are asked for this at a later date.
Thank you.