The Metropolitan police has quadrupled its cybercrime unit to 85 officers in just two months as the investigation into so-called “hacktivist” groups, LulzSec and Anonymous, gathers pace. Scotland Yard issued a fresh warning to computer hackers following the high-profile arrests of three British teenagers accused of having links to the groups. Detective Superintendent Charlie McMurdie, the head of the Met’s e-Crime unit, said on Thursday that the cybercrime division has benefited from a recent £30m boost to its budget…