DTA Article Number for form HS304 - UK national resident in Spain

Hi I am trying to assist with completing form HS304 and I am struggling to find key information. Can you advise? When claiming for exemption from UK tax we need to enter in box 3a of form HS304 the article number under which exemption is claimed. Whilst I know that income from a UK pension (not government service pension) and from a property rental in the UK is eligible for exemption, I cannot locate the article number under which exemption is claimed for these two sources of income. Please can you advise of the Article number under which exemption is claimed for: 1) A UK pension, and 2) Property rental income?

Hi
Pension income will be article 17 but UK rental property is not exempt and remains liable in the uk.