This restriction should not be there in the first place. All complaints should be investigated and treated on their own merits. To simply remove a section of the community from the equation is not fair or democratic.
Police staff and their families are unable to make a complaint against police under regulations imposed the Independant Police Complaints Commission.
This results in police staff having less democratic rights than every other member of the public. A son or daughter or parnter of a member of police staff can not complain about police. Even if he/she does not work for a police force themselves. How democratic is that?
Remove this restriction and allow complaints to be judged on their own merit instead of removing people's rights.