Thanks again. The Qatar site says that the transit service includes "Temporary entry visa to Doha, Qatar at no additional charge."

And https://visitqatar.com/intl-en/pract...s/visa-details says: "Qatar Airways passengers transiting in Hamad International Airport for a minimum of 5 hours are eligible to apply for the Qatar Transit Visa. It is free of charge, valid for up to 96 hours (four days) and open to passengers of all nationalities**."

So I assume that the visa will not be a problem.