I'm glad to hear that your submission to Making Tax Digital (MTD)  went through perfectly, 100seanby.

Your MTD for VAT Government Gateway login details may have been set up and entered correctly. And, that's why there isn't an issue when you submit your tax returns from the old computer.

If you're using a new computer, make sure you:

• Sign up for MTD for VAT with HMRC and have a confirmation email. This can take up to 72 hours to arrive.
• Have your MTD for VAT Government Gateway login details ready. This will be included in the confirmation email.
• Check that you are using the correct VAT registration number.

You can browse this article to help you complete the setup: Learn how to switch on the Making Tax Digital (MTD) for VAT feature in QuickBooks Online.

If you need more details about the submission, you can contact our QuickBooks Online Live Team. They can pull up your account and check your tax filing history.

In case you want to know who and when was the submission made, you can use the Audit log. QuickBooks Online keeps track of your activities in the audit log. You can see who made changes to your books and what they did.

Don't hesitate to post again if you have other QuickBooks concerns. I'll be around to answer your questions.