British Prime Minister Tony Blair is to meet police and intelligence chiefs to find out what further powers they want, in the wake of the London bombings.He has indicated he will discuss the controversial issue of using evidence in court, gathered from bugged phone calls. He said: “The one thing I think it is very important to recognise is that our security services and our police, partly through the joint terrorism assessement centre, do an enormous amount of work in gathering information not just from our own country but from all different parts of the world. I am satisfied that they do everything that is possible in order to protect our country.” Interior Minister Charles Clarke has disclosed plans to set up a global database of extremists. Anyone wanting to come to the UK would be checked against the list and, if on it, could be refused entry. Meanwhile, four men have been arrested under anti-terrorism laws in Stoke in central England although police say there is no link to the July 7 bombings in the capital that killed 56 people.