Thanks for getting back to this thread, @Dominika_.

I can see the importance of having another way to set up the UK account with my Canadian billing address. Currently, QuickBooks Online UK is limited to UK addresses, same as other regions. 

If you're located in Canada, you'll have to subscribe to QuickBooks Online CA version.

Additionally, let me share these link to help you manage your VAT in QuickBooks:

•  Set up and edit VAT settings, codes, and rates in QuickBooks Online.
• File your VAT return and record tax payments in QuickBooks Online

Keep me posted if you have further concerns with Making Tax Digital (MTD) in QuickBooks Online. I'll be happy to help you. Stay safe!