Definitely try the Zylkene. Jagger has come on leaps and bounds. Before he started the inappropriate peeing, I had noticed his activity levels had dropped, his routine changed and he actually seemed depressed. So I was already worried about him but put it down to it being hot... He's been on the Zylkene 2 weeks now I think, and he seems to have his mojo back. He's out and about and seems happy again.
Still an issue with the litter trays that I'm still scratching my head over... he will have a look, get in and then change his mind and use the new one in the hall or go outside and pee on the patio
which I then have to wash down.
The litter trays have always been in the conservatory but it's almost like he's decided he doesn't like them and/or their position anymore. Hendrix doesn't have an issue, he equally uses both locations, ie the new one in the hall as well. The litter tray issue is going to be a problem when Jon gets home on Sunday as he is adamant there will be no litter trays in the house.
Really hope you are getting to the bottom of the issue for your boy. They are sensitive souls these Bengals and easily upset by things we wouldn't notice or give a thought to!!