How do I pay tax on an inherited pension

A relative of mine died leaving behind a defined contribution pension of £44k. The pensions pot was not touched - no withdrawals were made. He died aged 80. The pension pot is to be passed to me to be withdrawn as cash. I understand tax is due at my income tax rate. My income each year is 12k, so I expect most of this pot will be taxed at around 20% I am unclear on how this tax is to be paid, do I have to fill out a form? If so which form and when/where do I submit this form, assuming I receive this money in the tax year 24/25.

Hi,
Please refer to guidance at:
Tax on a private pension you inherit
Thank you.