If I was to search though the documents on my PC – I suspect that I could find a copy of my complaint to the ombudsman (whenever I have upgraded my PC, I have copied the old PC contents to the new PC – I have letters that I have typed going back to 1997).
Almost certainly that initial contact would have set out the basis for my complaint, PC details, criminal activity reported, dates etc; but no proof – such as copies of letters to/from the police and the fact that the reported crimes had not been recorded or investigated by the police. From memory, about two weeks after my initial complaint to the ombudsman, I received their ruling (with no other contact with the ombudsman).