First time entry tourist visa

Hi All,
My parents would be travelling first time to UK on torusit visa.
Apart from rt pcr and day 2 covid test and passenger locator form, what docs do they need to carry? They would be getting travel insurance.
Do they need to bring bank statements or cash or something. I would be the sole sponsor and they would be staying with me.
If anyone can help that would be great.
Thanks.

If they do not speak English, you can prepare a letter for them to show at immigration control, which contains departing date, accommodation and your contact details. That's all they need apart from passport/visa.

Thank you.