I've read the whole thread and let me clear things up, nicofars.

The information provided by my colleagues about the Routine for QuickBooks feature is currently available in the US region. The UK and International (ROW) versions of QuickBooks Online (QBO) offer different features.

We also want to ensure that we are providing opportunities for you to share ideas, so I'll take note and submit this to our product engineers. They'll be able to review and include put the Billable feature to work in the mobile app.

You can stay up-to-date on the latest product improvements though our QuickBooks blog for UK.

In the coming season we’ll be writing more at the QuickBooks roadmap (UK) page.

We'll be around if you need anything moving forward. Have a good day.