My shortlist

Overall score: 8.9/10

• Maximum cat weight 15 kg
• Litter tray capacity 7,17 L
• Waste bin capacity 11,23 L
• Entry threshold height 35,2 cm

https://self-cleaning-litter-box-picks.co.uk/neakasa-m1-plus-review/

Overall score: 8.5/10

• Minimum cat weight Not specified
• Maximum cat weight 15 kg
• Litter tray capacity 7,17 L
• Waste bin capacity 11,23 L

https://self-cleaning-litter-box-picks.co.uk/neakasa-m1-plus-lite-review/

Overall score: 8.1/10

• Minimum cat weight 1,5 kg
• Maximum cat weight 10 kg
• Waste bin capacity 8 L
• Width 65,7 cm

https://self-cleaning-litter-box-picks.co.uk/petkit-purobot-max-pro-2-review/

Overall score: 8.1/10

• Minimum cat weight 1 kg
• Usable interior volume 106 L
• Waste bin capacity 6,7 L
• Width 50,8 cm

https://self-cleaning-litter-box-picks.co.uk/ubpet-c41-review/