Hi @burtybo, thanks a lot for your response once again.
So if you raise a DSAR through this link here, you'll see there's a section referring to outbound calls made within the last 12 months.
If you do need an itemised billing of inbound calls though from this time, you will need a court order and this request can go through your Police Liaison Officer.
I do hope this helps and please let me know if you need further support.
Many thanks
Tom_W