The operation in Hull checked 13 premises and 35 door staff. Of these four individuals were working unlicensed and another four door staff were discovered to be breaking their licence conditions by not displaying their ‘badges’ correctly.

Jackie Munn, SIA head of investigation said: ‘We were happy to support Humberside Police during this intelligence-led operation. Determined action will now be taken against those found flouting the law. There will be further operations to ensure licensed premises and door staff in Hull are operating legally.’

Investigators from the SIA were also out in Northamptonshire checking that door staff held valid SIA licences.

The SIA and the police visited 10 venues in Northampton city centre. 27 door staff were checked, 26 of whom held a valid SIA licence and one door supervisor was found working with an expired licence.

Jackie Munn said: ‘I’m pleased that, during these operations, most of the door staff inspected were SIA licensed. We also found a small number of individuals flouting the law, and they may be subject to police prosecutions.’

She added: ‘These checks were a great example of enforcement partners working together to help the public feel safer on a night out, but I want to reinforce the message that SIA licence holders are trained, qualified and professional operatives. There’s no longer a role for amateurs in this line of work.’