Lost my vat number ?

Thank you for posting here in the Community, @r-c-fletcher.

To recover your lost VAT number, I suggest reaching out to your VAT agency. They can provide you with this number in a safe and secure environment. 

Once you get the information that you need, here's how you can set your VAT, add, and edit VAT rates in QuickBooks Online: Set up and edit VAT settings, codes and rates.

Let me know if there's anything that I can help with setting up your VAT or anything else in QuickBooks Online, by leaving a reply below. Keep safe and have a great rest of the day!