UK Borders Bill

One theme that runs through the Bill is the giving of a wide range of increased powers to immigration officers. We are giving them more and more powers that are quasi-police powers, yet there are not the same sort of remedies for complaints against, and supervision of, immigration officers as there are for police officers. Should that not be considered in the Bill so that it is understood what someone can do if an immigration officer uses the new powers, because if a police officer were using them there would be a clear route for complaint and supervision?