Hi,
Please contact our PAYE helpline, to ensure your military pension has the correct tax code applied against it.
If you are resident in Cyprus, then your state pension will not be taxable in the UK when the time comes for it to be paid, as well as any private pension.
Once you are in receipt of your state pension and or private pension, please download and complete form DT individual, which can be found here
Double Taxation: Treaty Relief (Form DT-Individual)
Complete and sign the form, then send it to the Cyprus tax authorities to validate.
Once they return it to you, send it to HMRC at the address on the form.
Thank you