This is unfortunately all too common for GC women.
I'm sure it will already have been said but...
DO NOT, UNDER ANY CIRCUMSTANCES, ATTEND A VOLUNTARY INTERVIEW WITHOUT LEGAL REPRESENTATION
Find a Solicitor who is familiar with this law. The Free Speech Union may be able to help you.
What usually happens (according to the women who have found themselves where you are), the police will question you wrt to the alleged crime, you answer no comment; if you have any knowledge of the evidence for the crime beforehand your legal representative can read a prepared statement.
Do not volunteer any information, a voluntary interview is a fishing expedition. They would not need "your side of the story" if they had concrete evidence you had committed a crime. You get to present your side of the story as your defence in court of it comes to that.
Usually, because these reports are malicious, you will be released without charge or they may decide to investigate further.
Never forget the process is the punishment.