There hasn't been much publicity about this, but these measures (see link below) are specifically for the Licensed Trade (alcohol and late night refreshment), and came into force on 6 April 2017.  In short it is part of a clamp down on illegal working in Licensed Premises, with the key points being:

Applications by individuals must include evidence of their lawful immigration status or right to work, otherwise the application must be refused.   

The relevant licence application forms have been updated.  So if nothing else, make sure you are using the current ones!

Licences will lapse if the person's immigration status or right to work comes to an end.

Immigration officers have wide powers of entry to check for immigration offences.

Immigration Enforcement may request the review of an existing licence as a result of enforcement activity.