From reading all your replies folks, it seems I’m far from alone in this. So much of your descriptions follow closely with what happens to myself.
I realise now also that because I normally go straight to the bathroom by habit when I get the urge, from the warm or running water having decided to try and see what happens if I try and hold it for a bit longer , I get the funny spasm sensation down there and a session of minor squirts . Then I’ll get to the bathroom and nearly void in the nappy before I’ve got my trousers down. Stopping my pee flow today with my muscle power experimentally resulted in difficulty getting it to start again and when it did it was a slow unsteady stream. Then on stopping and fastening up trousers a gush into my nappy. That gush btw. happens nearly every time I go to use the bathroom now .
I managed to get some better quality terry junior nappies from Amazon than the ones I was using previously which are also slightly larger at 70x70cm to use as folded inserts in my Cuddlz terry briefs . They are much more absorbent if feeling slightly bulkier at least I’m feeling much drier and the plastic pants aren’t getting so wet on the inside. Old school I realise but I don’t feel confident to use only a Tena type pad +brief setup. I was reminded of that when I had to make an emergency call at Wetherspoons toilet in town and peed on the floor and my trousers before I could aim properly. That’s without even drinking there. The council has closed all the public toilets in our town. In future I may double insert and just use the nappy instead while in town. Councils closing public toilets that we pay them council tax money for. Maybe a topic to bring up by itself.