Almost half of all reported crime is being written off by Scotland Yard, figures show, fuelling fears that victims are being ignored.
40 per cent of burglaries in 2012/13 were written off, almost a quarter of robberies and 80 per cent of bicycle thefts
In some offence categories as many as eight in ten reports are â€œscreened outâ€, according to figures obtained under the Freedom of Information Act.
Screening out means that while the reported offences are included in official crime statistics no concerted effort is made to investigate them beyond an initial consideration, mainly because officers believe the culprit will not be found.
The Metropolitan Police â€œscreened outâ€ 346,397 reported crimes in 2012/13 â€“ some 45 per cent of all offences.
Some 40 per cent of burglaries were written off, almost a quarter of robberies and 80 per cent of bicycle thefts.
Roger Evans, the Conservative member of the Greater London Assembly, who obtained the figures, said: â€œItâ€™s a disgrace that the Met Police are refusing to investigate a huge number of acquisitive crimes.
â€œA victim of crime shouldnâ€™t feel that the police have no interest in them unless you are physically or sexually assaulted.
â€œResources are tight; but crimes such as burglary are, in no way, minor. They can have a devastating impact on the confidence and well-being of the victim.
â€œMoreover, many criminalsâ€™ illegal activities escalate each time they get away with it so we are sending out a very dangerous message.â€
The figures also showed more than one in ten common assaults and assaults with injury were screen out last year â€“ the equivalent of 11,000 violent attacks.
Some 23 per cent of robberies were written off as were three quarters of car thefts and 85 per cent of thefts from cars.
Mr Evans added: â€œIf you are a thief in London, you can rest assured that over three quarters of your crimes, reported by victims, will be ignored by police.
â€œWith the high availability of CCTV in London there is no excuse for this lackadaisical attitude.
â€œWe need a dramatic shift in the way police see these crimes â€“ they may not be exciting to investigate but they are serious.â€
Mr Evans said victims of crimes should be able to appeal to their local safer neighbourhood boards â€“ groups of local volunteers working with local police which come into existence from 2014 â€“ if the police decide not to investigate their crime.
A Scotland Yard spokeswoman said: â€œIt is incorrect that the MPS does not investigate a high number of crimes. The MPS investigates every single allegation of crime that it receives.
â€œA number of crime allegations will require secondary investigation once the initial investigation is complete.
â€œThe MPS currently conducts secondary investigations in approximately 60 per cent of all crime allegations, as compared to the national average of 45 per cent.
â€œThe MPS is concentrating on improving the quality and rigour of initial investigations in order to improve the service to victims by reducing the need for follow up visits.â€
Last year the HM Inspectorate of Constabulary warned that up to one in four incidents completely ignored by the police should have been recorded as a crime.
Separate to â€œscreening outâ€, forces will also designate some reported offences as â€œno crimesâ€, after an initial assessment concludes no crime was actually committed.
However, a study by the HMIC said that, nationally, one in seven â€œno crimesâ€ was dismissed wrongly but in the worst offending force, the Metropolitan Police, it was as high as one in four.
Up to half of crimes written off by Scotland Yard