In a construction contract, funding has been stopped completely and three certificates are yet to be paid. Furthermore, the contractor has suspended obligations. Since this has taken place, the site has been vandalised. Who bears responsibility for this?

It is stated explicitly in Section 112 of the Housing Grants, Construction and Regeneration Act 1996 provides that in the scenario described in the question the person to whom the sum is due has the right to suspend performance of all contractual obligations.