Exclusive: Speaking out is 'unhelpful to us all', memo says.
'We found out about the collapse with everyone else in the news.'
The five things you need to know about politics today.
Prisoners left in squalid conditions as Carillion failed to deliver.
Minister says firm's execs could face "severe penalties"
Ex-Chancellor blames civil servants in Evening Standard editorial.
Whitehall chiefs shrug: ‘companies fail and succeed’
Tens of thousands of jobs and vital services that hundreds of thousands of people depend on are on the line.
'The fallout from this could be horrendous.'