Retirement tax questions

Hello PK

 I am a permanent resident, and everything is in my name. It is a UK Government pension and a life insurance for me that matures on a specific date and pays out. The other is an endowment policy with life insurance that also pays out at a specific date (matures). I am 66. The Uk withhold taxes when they pay out. The pension has a lump sum that is tax free in UK.  I think I do need to declare them, and I dread paying more taxes!