After reading some advice and recommendations from others here, I decided to ask the police for any information held on me. I eventually got a reply which included this:

  On this occasion we have restricted access to your personal data because it is mixed with information which relates to the prevention, detection, investigation or prosecution of criminal offences or the execution of criminal penalties, in accordance with: • Section 45 (4) (a) – to avoid obstructing an official or legal inquiry, investigation or procedure Disclosure of information relating to Police tactics, procedures and operations is likely to obstruct future inquiries and investigations. As such, the Chief Constable is not obligated to disclose your personal data to you at this time.
Once the investigation has reached its conclusion, you are welcome to resubmit your request.

Noting the clear statement that there was a current investigation, I've asked both my probation officer and offender manager. Both said they had no knowledge, but after I asked my OM top check up she replied:

  If your request relates to information contained in our reports raised following our visits, then we are unable to disclose this information.  This is due to MOSOVO visits being on-going and referred to as “Once the investigation has reached its conclusion”. and will be until your RSO status expirers. 

I feel that she could have said this in the first place, or even it being stated more clearly. I suspect its a bit of 'stonewalling' or something.
What do you think? I don't want to 'rock the boat', but ...

Thanks for any comments