Hi BOBU L,
A UK resident is required to declare their world-wide income.
This is done via a Self Assessment tax return.
I would advise that you contact the Self Assessment helpline on 0300 200 3310 or via webchat here:
Self Assessment: general enquiries
Please advise my colleagues of the nature of your overseas income, as when it comes to pensions, some are not taxable in the UK.
Thank you.