Hi,
The 5% withdrawal is not tax free, it is tax deferred.
This is because in each insurance year you can withdraw up to 5% of the premium paid into your policy without a gain happening in that year.
As there is no gain, there is nothing to report to HMRC.
The policy provider will account for all amounts paid from or withdrawn from a policy have to be added into the calculation made when your policy ends.
Please have a look at helpsheet HS321 at
HS321 Gains on foreign life insurance policies (2024)
Thank you.