The PM's strongest incentive is to maintain confidence of a majority MPs, which requires those MPs believing that the actions of the government won't prevent their re-election. It's a pretty strong public accountability measure imo, shown by the turnover in PMs who have lost that confidence.

Including young IT help desk staff. One incident involved a driver issue that, despite me telling them it just needed an updated driver, took 3 days to diagnose that it needed a driver update 👍 😀