Are there (a) certain types of project (eg housing, office accommodation, specialist accommodation, highways, street lighting,  equipment etc) and (b) certain types of risk (eg negligence of the contactor/supply chain, business interruption cover for banks, officer's liability, statutory cover, third party liability, vandalism, construction phase cover, property damage all risks), which are more/less suited to coverage by the public sector. If so, which are they and why?  What are the concerns, constraints or procedures that would be relevant or required for any such public sector self-insurance? 

Others respondents will be better placed to respond on this point