Hi Suresh,
It is the gain on the policy that is taxable and would be declared in the foreign section (SA106).
As a UK tax resident, you are taxed on your world-wide income, by delcaring it in a Self Assessment tax return.
If you were born outside of the UK, then you are non domiciled for UK tax purposes.
This does not need to be declared, unless you wish to apply the remission basis of tax.
This can only be done on a paper tax return (SA100) and is declared on SA109, which can be found here:
Self Assessment tax return forms.
Thank you.