I'm here to take care of your concern with QuickBooks Online (QBO), @howard-dpm1-co-u.
Before we can proceed further, I'd like to ask for additional information on the issue at hand. This way, I can provide an answer to your query, or share the necessary steps for a resolution.
You can also check out this page from time to time: QuickBooks Status. At this time, QBO for the United Kingdom is working without any issues. Here you can find updates for any issues we detect in the system. You even have the option to subscribe for updates.
Let me know in the comments below if you have additional questions. I'll be around to help you out. Have a nice day!