The Tory leader plans to stop supermarkets selling boxes of strong lager at rock-bottom prices - sometimes cheaper than the cost of bottled water.

Late-night kebab shops and takeaways that sell booze to drunk customers in the early hours will be targeted too.

Mr Cameron is also looking at radical plans to TREBLE taxes on alcopops and strong beers and ciders.

This would slap £1.30 on a four-pack of Carlsberg Special Brew, £1.25 on a bottle of powerful cider and 50p on bottles of alcopops.

The duty on weaker drinks would be CUT to encourage people to buy them instead.

Mr Cameron promised "serious changes" yesterday after joining cops on a late-night patrol in Hull to see the damage caused by cheap booze.

He said: "Drink-related violence and drink-related crime are a massive problem.

"We need to look at the unbelievable availability of very cheap drink.

We've got a situation which I saw in Hull last night where kebab shops sell high-strength lager at 2 o'clock, 3 o'clock in the morning."

There is growing evidence that many youngsters get "tanked up" on cheap booze from the supermarket before heading out in the night.

And cops fear access to alcohol after pubs and clubs have closed can be a key factor in triggering violence or injuries.

g.wilson@the-sun.co.uk