This McAlpine space saving kitchen sink trap is brilliant. Allows you to direct the sink waste pipes and trap to the back of the cupboard. Seen this thanks to another Redditor who
1/2 Inch x 40mm Flat Kitchen Sink Drain Waste Trap
Plumbing sets with self-cleaning trap: Plumbing sets with Ø114 waste for kitchen sinks - L.B. Plast srl