Boris Johnson today dismissed continuing concerns over the News of the World's use of phone hacking as "codswallop" that "looks like a politically motivated put-up job by the Labour party".

Speaking at his monthly grilling by the London assembly, the mayor of London – who was warned by police in 2006 that he'd had his voicemail accessed, and was chair of the Metropolitan police authority (MPA) when the Guardian revealed last year that much larger numbers of people might have been by affected than had initially been known – insisted that he was "satisfied" by the Met's investigation of the matter.

Asked by Labour assembly member Joanne McCartney about any conversations he had had with police at the time, Johnson replied that "to the best of memory I was satisfied with the police position, which was that no new information had been substantively revealed and therefore nothing more was going to be done. So I don't think I actually had any conversations."

He later added that he didn't recall "any specific briefings on this".

Johnson went on to remark that "Labour politicians have had five years to discover their principles about this and get outraged about what may or may not have happened," but had not acted until they were out of office and were now doing so "simply in order to score party political points against the prime minister's press spokesman", a reference to Andy Coulson, the former editor of the News of the World.

He added that, "unless there are significant new facts brought into the public domain that actually change the potential police case and make necessary a fresh look at it, then I don't propose to change my views".

Pressed about his being "a victim or potential victim" of hacking he refused to "go into detail about what seems to be a case that has been very substantially investigated by all sorts of bodies. I don't think the question of whether or not I am a victim is in any way new. It doesn't seem to me to add to the weight of evidence."

Johnson said he would "have to look back at my notes" in order to recall how much detail he was given about any intrusion at the time he was alerted, but doubted he would find much to add.

Johnson was also asked by McCartney, who is a member of the MPA, if he had had discussions about the matter with his "deputy for policing" and successor as MPA chair, the Conservative assembly member Kit Malthouse. He replied that he had had "almost continuous conversations with my deputy for policing about this and other matters", and in response to a suggestion McCartney said had been made to her that he or Malthouse might have been "acting as a conduit between the police and the Home Office" over the News of the World allegations he said that this was "highly unlikely", because the two organisations were "joined at the hip".

The mayor's playing down of the phone-hacking affair comes as a number of high-profile alleged victims begin legal action against the News of the World. Johnson's predecessor as mayor, Ken Livingstone, who was in the public gallery for some of today's question time session and may soon become Labour's 2012 mayoral candidate, has recently written to the Met to ask if he is among those who were or might have been phone-hacking victims.