If you are UK tax resident then all taxable income needs to be declared to the UK for that tax year, unless you are claiming either the remittance basis where you are not bringing the income into the UK, or split year where you only declare the income from any period after which you arrived in the UK.
You can find further guidance here:
Residence, domicile and the remittance basis: RDR1
RDRM12000 - Residence: The SRT: Split year treatment: Contents
Guidance on foreign life insurance policies, in case this needs to be reported, can be found here:
Gains on foreign life insurance policies (Self Assessment helpsheet HS321)