Is Brexit the reason McDonald's is running out of milkshakes?

As gaps continue to appear on supermarkets shelves and restaurants take unavailable items off menus, Britain’s supply chains appear to be at the centre of a perfect storm of pandemic disruption coupled with post-Brexit labour shortages. Help support our independent journalism at <a href="https://www.theguardian.com/infocus">theguardian.com/infocus</a>