Further to government advice ~ should property managers suspect that cladding on a building they manage, is unlikely to be compliant ~ first on the list is:
Notify Fire and Rescue Service
Government advice is to inform the local fire service or protection department as failure to do so may put fire-fighters as well as residents at risk. The fire and rescue service will carry out an urgent inspection with the responsible person to ensure they know about and are introducing appropriate interim measures. The fire service will carry out further inspections once the interim measures have been completed.