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You would declare any dividend income within the tax year, for example, from 06/04/20 to 05/04/21.
Foreign income needs to be declared on your tax return if you are UK tax resident.
If this is your only source of foreign income and the dividend amount is less than £2000, and no tax has been paid, then you can enter this on the UK dividend section. Otherwise this will need to be reported under the foreign income section.