The Crime Survey for England and Wales (formerly the British Crime Survey) should provide some insight, since it's based on interviewing a random sample of the general public.
It suggests that around a third of violent crimes are not recorded by police - but, contrary to the gp's assertion, that proportion doesn't seem to have changed significantly since the BCS began in 1982.
It suggests that around a third of violent crimes are not recorded by police - but, contrary to the gp's assertion, that proportion doesn't seem to have changed significantly since the BCS began in 1982.