The German double tax treaty says:
Article 17 Pensions, Annuities and Similar Payments
1)Subject to the provisions of paragraph 2 of Article 18, pensions, other similar remuneration or annuities arising in a Contracting State and paid to a resident of the other Contracting State, shall be taxable only in that other State.
2)Notwithstanding the provisions of paragraph 1, payments which are made in accordance with the social insurance legislation of a Contracting State shall be taxable only in that State.
So if my client is in receipt of a state pension from Germany, then just to be absolutely clear - this is not taxable in the UK? (where he is now fully resident). Would you report it in the white space of the tax return?