Strict criteria to work for councils round here now and don't forget its who you know as well.
They do prefer NICEIC Approved Contractors and their own "long arm reach set ups" are normally NICEIC as well.
They like to see a good turn over £££, plus past contracts/clients and ask for 10 million pounds liability insurance.
Some ask you to join construction line, its not a simple process.
The Government brought in a scheme where councils pay within 14 days to keep little firms viable and it was happening a couple of years ago.