Boris to follow transport drink ban with London alcohol czar

Mr Johnson has already said he will ban alcohol on the Tube and buses if he wins the election for Mayor.

He said: "There are already boroughs doing excellent work in tackling underage drinking and the pubs, clubs and shops that encourage it. A London alcohol czar is one idea that could help to roll out policies that work across the boroughs."

He is also prepared to publish league tables naming and shaming councils which fail to act against pubs and bars which sell alcohol to children.

During his meeting with a panel of Evening Standard readers, the Tory candidate went on to pledge to introduce academic scholarships for university students. He said the awards would be funded by the London Development Agency or the promised Mayor's Fund for London, financed by private businesses.

However he stopped short of offering free travel for all students, a pledge from his Lib-Dem rival Brian Paddick.

When asked about students he promised to look at the option of free travel but said: "What I will give the students, and I hope it will help lots of poor students, are scholarships. I think we should be using the Mayor's funds, maybe from the Mayor's Fund for London, to have scholarships based on academic merit for student who are finding it very hard to afford their student loans, their top-up fees and all the other burdens they have."

Mr Johnson also stood by one of his major pledges - to make London safer.

He said he would start by chairing the Metropolitan Police Authority and would concentrate on addressing so-called "minor" crime which he said is often not reported. He also reiterated plans for an online crime map on which people could view the number of crimes reported in their area.