NEC ECC: Contract not paid suppliers and lost plant/equipment

The Contractor has not paid its suppliers and a plant which was being used to complete the works has gone missing and the Contractor could not explain where its gone.

What am I able to do regarding the Contractor becoming insolvent/bankrupt although currently he isn't but may be. Also, what options can I take regarding the item the Contractors lost?

This is under NEC4 ECC.