Increasing the price isn't going to solve the problem IMO. It will only penalise the sensible drinkers amoung us, increase Tesco profits and the Governments tax coffers.
If you increase the price, more people will go abroad for cheap booze. There will be an increase in illegal alcohol, crime to fund the drink and possibly and increase in 'soft' drug use if alcohol is on par or more expensive.
The problem is those people that sell to under age drinkers and the morons that think its clever to buy them the drink. The government is proposing a proof of age scheme for cigarettes, why the hell don't they do the same for alcohol for EVERYONE. If you cant produced your 'I'm over 18 and allowed to buy booze' ID card, you dont get sold any.