The current funding crisis in many NHS hospitals has been caused in part by PPP unitary payments that account for a relatively significant proportion of Trust revenue budgets. The 'buy now, pay later' PPP model has racked up over £250bn PPP debt in the UK, which imposes financial obligations for the next 25-40 years. The inflexible nature of these projects limits the public sector's ability to renegotiate and adapt contracts to accommodate changing economic and social conditions and needs. This is a microcosm of intergenerational problems.