Thanks for this Kaz. I'm using the same litter as the breeder, and open trays; I'll definitely try a covered tray in case the current ones aren't private enough, although she does seem to be quite happy peeing in front of us / next to us in bed / on the sofa! But I'll try anything at the moment. Thanks for the tip on the treats too - will definitely try that.

She could be missing her siblings; as well as 4 brothers / sisters, there were quite a few other adult cats in the breeder's house, and I do worry she's lonely when we're out at work (judging from how she always wants to be in whichever room we're in, loves being cuddled / playing, and when we have people over she's very interested in them). If this is the source of the problem, will she get used to being the only cat in the house and on her own sometimes or is the solution to get another kitten for company?

Thanks! J x