Many thanks for the update, Happy! You are quite right that it is very frustrating to not get a follow up when you have become invested in someone else's concerns, and yours was potentially a very serious problem if your DH hadn't realised how ridiculous and unfair he was being to you, and your shared life.
As for him spending an hour daily apparently having a bowel movement - which I know you only mentioned because it was part of your DH's defence case (please discourage him if he ever decides he would like to be a barrister 🙈) - I think that many Mumsnetters, including me, will understand what is happening here - unless he does actually have a rare problem with his bowels, in which case he really does need to see his Dr if he hasn't already done so - your DH seems to be using the classic, mainly male solution, to having some relaxation time, without the fear of being interrupted, as he/they seem to think that nobody can really complain about him/them spending time performing an essential part of any animals' basic bodily functions!!
How wrong these unfortunate men are if they share their lives with a woman of even average intelligence and commonsense. My husband spends his 'pooping' time looking at his phone, but before the time of smart phones, he used to keep a pile of magazines (F1, Hi Fi, etc, not the other sort!) by the toilet, until I convinced him that that was a disgusting and unhygenic habit. Sadly, I haven't been able to convince him that the same goes for his personal phone, I think he is actually addicted to it - but that would be for a differnt thread. So generally, I have managed to talk him down from about 40 minutes on the toilet, to about 25 minutes × 2 times per day, but if he ever has to 'go' when we are out, it somehow doesn't take him more than 10 mins, and usually quite a bit less... 😉