The Chief Medical Officers' guideline for both men and women is that:
You are safest not to drink regularly more than 14 units per week, to keep health risks from drinking alcohol to a low level
If you do drink as much as 14 units per week, it is best to spread this evenly over 3 days or more. If you have one or two heavy drinking sessions, you increase your risks of death from long term illnesses and from accidents and injuries
The risk of developing a range of illnesses (including, for example, cancers of the mouth, throat and breast) increases with any amount you drink on a regular basis
If you wish to cut down the amount you're drinking, a good way to help achieve this is to have several drink-free days each week
DOH (January 2016). How to keep health risks from drinking alcohol to a low level: public consultation on proposed new guidelines.