Banning the consumption of alcohol in public places, i.e. alcohol can only be purchased for consumption at homes but no longer in bars, restaurants etc.

Banning of alcohol consumption is through the government intervention is necessary to curb drunken driving which leads to road accidents.
In this economy without government intervention, the private equilibrium is attained at E where the Private marginal benefit curve intersects the private marginal cost curve for consumption of alcohol.
Bunning of consumption of alcohol in public places in the UK will result to an increase in the Social marginal cost since people will order more to drink from their homes while the producers will increase the price of the alcohol to cover the cost of delivery of their products. This will result to an increase in the Marginal Social Cost.
The social equilibrium will shift due to an increase in the Social Marginal cost and thus reducing the Social benefits that would have been derived from creation of the policy.
Therefore, the policy would bring more harm than benefit and thus I would recommend looking at restricting the number of hours instead of having a total ban on the consumption in the bars.