Self Assessment for UK savings interest

Hello HRMC. I am a UK resident for last and this tax year and will have to do a self-assessment for 2023/2024. I had a one year fixed rate saving deposit started on 27/06/2023 and its maturity interest £300 was received on 27/06/2024. What will be the amount to declare during my self-assessment? Should I declare this £300 for tax year 2023/2024 or 2024/2025? Or I should fill £250 (prorate 10 months interest) for tax year 2023/2024 and keep £50 (prorate 2 months interest) for tax year 2024/2025? It would be great to have the detail of the best way I have to fill. Thanks you in advance for your reply.

Hi, If the interest was not received until 27/06/24 then this will be the 2024/25 tax year. 
Thank you.