Further concerns have been raised over the use of vaccine passports in the U.K., this time via a leaked Government report that says the measure could cost venues millions and fuel the spread of COVID-19.

The report, compiled by the Department of Digital, Culture, Media and Sport and published by The Telegraph, says requiring vaccine evidence for entry into venues could encourage people to go to poorly ventilated pubs instead. In addition, venues would need to hire thousands of new stewards (as they have been pointing out), plan for longer entry times, and turnover could drop between £345m and £2.07b.

As of now, the British Government hasn’t introduced the measure but it is in reserve if COVID infections continue rising and place “unsustainable pressure” on the National Health Service. Nightclubs, indoor settings with 500 or more attendees, outdoor crowded settings with 4k or more attendees, such as festivals, and any settings with 10k or more people, such as large sports stadiums would be affected.

In Scotland, the scheme was introduced this weekend and branded an “unmitigated disaster” by the Scottish Hospitality Group. Some venues closed early, foot traffic was reported to be down by 40% and 550 people were refused entry, reports the BBC.

The DCMS report also points out a number of positives of the scheme, including increased consumer confidence around safety and the potential avoidance of capacity caps or closures.