Hello there, volant.
I want to make sure you can import data from Xero to QuickBooks Online.
If you're trying to import data to the UK version of QuickBooks, you can use Intuit Data Services. They have the ability to convert the UK version of the Xero program. For the steps on how to import data, you can visit the article I've attached below:
Please let me know if you need more help with importing data from Xero. You can add more details by clicking the Reply option below.