For VAT-registered sellers, what specific reports do you usually generate from Seller Central to submit for your VAT returns?

I want to ensure I’m sending all the correct and necessary data.

To file UK VAT Return your accountant will need sale invoices and purchase invoices for that specific quarter. VAT summary, Amazon fees summary can also be provided.

Go to: Payments - reports repository. Then download the summary as a PDF for the desired date range.