Seven in ten night-time economy businesses believe requiring customers to show Covid status certification will have a negative impact on trade.
That's according to a flash survey of 700 nightclubs, bars, pubs, restaurants, promoters and venues by the Night Time Industries Association (NTIA).
The majority of respondents said asking guests to provide vaccine passports, proof of a negative test or immunity would harm businesses, and 69% believe the measures are not necessary to run their event or premises.
The prime minister said yesterday that vaccine passports will not be used for the reopening of outdoor hospitality this month or indoor venues in May, but they could "potentially play a role" in settings such as nightclubs, theatres and festivals in future.
Hospitality owners previously told the Caterer that enforcing Covid certificates would create a "nightmare" for businesses and place staff in a difficult position.
Michael Kill, chief executive of the NTIA, questioned why nightclubs could face stricter reopening rules than other close contact areas of the economy.
He said: "Initial feedback from consumers is that many are not comfortable using health information to gain access to venues or events in the UK, and the use of certification will discourage customers from attending these environments in the future.
"Businesses are likewise frustrated at the way in which the government is communicating these potential restrictions, with many feeling that a considerable number of questions have been left unanswered.
"These businesses have suffered extreme financial hardship for over 12 months and are desperate to open, but they have been left feeling uncertain once again following a government announcement."