I can route you to the right support team who can provide the list of Intuit-Authorize Hosting Providers for QuickBooks Desktop (QBDT), Martinh.
We need some changes on how to connect with QBDT for UK. Please visit this link: https://help.quickbooks.intuit.com/en_GB/contact, then choose QuickBooks Desktop.
Click Data & Company Files, then Data integrity. From there, the system shows Step 2 for the contact information.
You can also visit these links for additional information:
Or visit out Intuit App page and look for hosting apps that is already integrated with QuickBooks through this link: https://quickbooks.intuit.com/app/apps/home/.
Let me know if you have follow-up questions about this by commenting below. I'll be right here to provide the information you need.