Who is liable for a breach of the AWR?

Claims under the Agency Workers Regulations 2010 (AWR) can be made against any party in the supply chain. Who would be liable for a claim under the AWR?
Election 2024: How Labour’s plan for employment law affects the recruitment industry

As the 2024 election approaches and with Labour currently ahead in the polls, it’s important to consider how their proposals for worker rights could impact recruitment.