I'm now 15 years post-sentence and on SOR. PPU have always visited once a year, every time there's two of them and one sits on a laptop and I've always felt they have recorded said meetings even though I believe their remit for home visits is just to check I am resident, not to use it as an impromptu interview.

In these last fifteen years I have had a full surgical sex change. Never went for a Gender Recognition Certificate as it only changes the Birth Certificate which is only relevant if you need a passport, or want to get married, or want the right name on your death certificate, none of which matter to me.
As I was up for the 15yr point and could ask to be removed from the SOR I never considered it (I had the dates wrong and thought this wouldn't be relevant for another 6 months) PPU texted me and asked if I wanted to apply to come off the SOR.  I blindly agreed and put it a hastily-worded request.
Their first response was to say they had no record of a Gender Recognition Certificate on their records - why would they? It's a replacement for a Birth Cert and they definitely shouldn't be keeping copies of SO's birth certs.
Then they asked me to take a polygraph, which I flatly refused - reasons given being Ames fooling it twice, plus the Jeremy Kyle fiasco.

Unsurprisingly the decision came back not to remove me from SOR but now to add SHPO because part of my offence involved images and because I still used pcs...

Anyway my original question now is what is the legality of PPU using home visits to record you on their laptop as an unofficial formal interview? Am I within my rights to a) refuse to speak if that home visit's only remit is to check I live at the residence?
thanks