My cat is 14. Fairly able with 3 legs. He has always done his toilet business outdoors, if we're away for a night or two he uses a litter tray no problem.
In the last few weeks we have come downstairs in the morning / home from work and he has wee'd all over the work tops. We've had to chuck out our chopping boards / toaster / kettle / storage jars of tea etc etc.
We started bringing in the litter tray overnight but he'll only use it occasionally....even when it's there he will have jumped onto the worktop and peed.
Wtf?