Hi,
Article 17(2) of the the tax treaty between the UK and Bulgaria does not include tax relief for state pension.
This means the state pension remians taxable in the UK and should not be included on the DT individual form.
As the other pensions you mention, are non government, then you need to mention each of those pensions individually and include relevant details, but only for those that have commenced payment.
Any pensions still to commence, will need to be declared in a further DT indidivual at a later date, but only after they commence payment.
Thankyou.