Project Bank Accounts are ring-fenced trust accounts whereby construction project cash (from the Employer) is held by trustees, protected from the various contractors' risks of insolvency.
This benefits the supply chain in particular because:
Despite their clear benefits, adoption of Project Bank Accounts (or 'Project Payment Accounts' as some new FinTech companies are calling them for regulatory reasons) has been slow.
Highways England is the largest user of Project Bank Accounts, but they are increasingly being used in the private sector as well to manage the risks to the supply chain and to ensure that the Employer's money is only used on the Employer's project (and not, for example, to 'shore up' another of the Contractor's projects).
* we aren't able to find any information about this online, but these banks all appear to be government suppliers from the information we found at the Local Government Association Project Bank Account Masterclass notes (though note that these are dated back in 2020).