Flip Up Seats are toilet seats with a spring mechanism that keeps the seat in the upright position so that it cannot be urinated upon. This simple innovation effectively solves a leading passenger dissatisfaction driver as seen in the NPRS. Some men stand and a significant number of women hover over, rather than sit on the toilet seat, their actions foul the seat which is unpleasant and unhygienic for subsequent users and a long standing source of complaint. 
The NPRS further notes that despite, spending billions on new trains, this issue has still not been addressed and is fundamental more important than WiFi and at seat charging. Flip Up Seats solve this issue and are PRM TSI and EN45545 compliant.