Having to notify foreign travel comes from being on the Register, not the SHPO. So, if you successfully apply to have the SHPO discharged, it won't change anything technically, but it might annoy the police if they oppose the discharge and it is discharged anyway.

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If you are to punish a man retributively you must injure him. If you are to reform him you must improve him. And men are not improved by injuries. (George Bernard Shaw)

Its not really clear how Cyprus would know about the conviction. if the ppu are saying they did not place any notices on the passport, that is suggesting there is no interpol green notice in place, but the ppu would not necessarily know, because they do not have access to the interpol database, it is a different officer within the force who handles that.

might be worth taking a day trip to france for example, to see if there are any issues there

Any notices are requested by the National Crime Agency in consultation with the chief of police at the relevant force, so the local plod might not know. If the person had travelled before, while British nationals were still on the Schengen Information System, that information might have been kept locally after British nationals were removed from the central records.

As for travel to France, if you're not near the Channel coast, you could try a cheap Eurostar ticket from London, as the French passport control is there, not in France. Might be cheaper than a return flight.

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If you are to punish a man retributively you must injure him. If you are to reform him you must improve him. And men are not improved by injuries. (George Bernard Shaw)

So from what I have recently been told, I did actually have a marker - a green diffusion notice to interpol was added when I registered for the first time. My offender manager at the time actually told me I didn’t have any notices or markers but it was removed a month after I attempted to travel to Cyprus. I assume this is how they were aware of my offending as I had never been to the country before. I also wasn’t on the register pre-brexit so no hangovers from there. I am due to head to Barcelona soon and hoping I don’t have the same issues but when I filled out my travel form it came with a notice on the front suggesting the relevant embassy be contacted to check what their policy is for admitting RSO’s.

I followed the advice though I’ve been to Spain before with no issue. The embassy eventually replied saying they can’t tell me due to GDPR regulations and they don’t know the specifics of my offending so it’s left me concerned for sure. No clear guidance or reasoning - always just ‘down to local border enforcement’. Cyprus had recent images of me on some sort of official looking papers but it wasn’t anything above a green diffusion notice so I’d be very mindful of travelling there.

It was a very unpleasant experience, shouted at and a lot of back and forth between officers in their language so I had no idea what was going on. Then kept in a room for hours whilst my partner waited elsewhere to be put on a flight back to a different UK airport that night.

Scared of trying again in a couple of weeks to Barcelona but can’t wait another 5 years.

"green diffusion notice to interpol was added when I registered for the first time"

So years ago when you first registered, they put up a permanent memo to planet Earth? Or a brief memo which the Cyprus borderers happened to keep a record of?

I posted on this myself a few days ago & was told of this thread.

I was refused entry to Cyprus less than 2 weeks ago, despite having successfully travelled to Norway & Italy since my conviction. To say it stunned my family I was travelling with is an understatement. This was a real reality check of the consequences of my conviction for both me & them. Both my PP & SOM were surprised I'd been refused entry but my SOM did clarify that a green notice had been put on me. I knew this must've been the case as the Cypriot border staff knew what my conviction was for & had a picture of me that isn't recent on their paperwork.
All but 1 member of staff were were considerate, even apologetic & the 1 who wasn't was given a dressing down (judging by the tone of the senior person to them, I obviously don't speak Greek Cypriot!)
I was told that it was nothing personal but they don't admit anyone with a sexual offence of any type & also any offence that has 12 months or more sentence (unspent). They got me through the process simply & gave me an ununiformed officer for the escort to the plane. They even put so much effort into getting me to fly as soon as possible as in their own words "you don't want to be in our rooms"
I now know that Cyprus are going by the book so they can get more involved in the EU & ETIAS which probably explains the new harder line.

My concern is that now I have a documented refusal on the Schengen system that I won't be allowed to visit family in Norway & Italy again & nowhere I've searched seems to have reliable, consistent advice. It's ok if I travel with the rest of my family as they'll be able to stay but the hardest thing is risking travel with my wife. If I'm refused entry to a country, she won't want to stay alone & will have to arrange & pay for travel home separate from me, another knife in the heart of our fragile marriage, entirely caused by my stupidity.. Reality hits home hard sometimes.