Yes.
In the upper corner of the flag nearest the flagpole, the wider diagonal white stripe should be above the red diagonal stripe. If the red is above the wider white stripe the flag is upside-down.
https://www.college-of-arms.gov.uk/resources/union-flag-faqs
Even our own government screws it up though https://www.telegraph.co.uk/politics/2020/03/05/union-flag-has-flying-outside-parliament-upside/
Parliament has exclusive cognisance, it works how the members want it to work.