The Engineering Employers' Federation estimates that Rover has around 400 suppliers employing up to 20,000 people.

The Birmingham Chamber of Commerce has surveyed 25 suppliers who says they are owed £9m.

It says the total amount owing to all suppliers must be tens of millions.

The government has pledged £40m to help suppliers.

Most firms only supply 5-10% of their output to Rover. But there are estimates that 2,000 jobs could be lost in addition to up to 6,000 jobs at Rover.

The suppliers include:

Wagon Holdings (doorframes). Employs 4,800 worldwide. Owed £900,000.

Trafficmaster (SatNav systems). Owed £540,000. 4,000 employees.

Avon Rubber (hoses). Loss of £1.4m of sales over next six months, equivalent to 1% of sales, 750 UK employees

Alumasc (precision engineering). Owed £200,000. Sales to Rover 3% of turnover. 1,000 employees

Stadco (body pressings), 280 workers, £150m turnover.

AP Smith (metal pressings). Rover 8% of sales, 90 employees

LAP Electrical (electrical components), 200 employees, turnover £7.5m

Hydrapower Dynamics (hoses and tubes), 65 employees, £6m turnover

Astra Engineering Products (pressings), 50 employees, turnover £3m

APT Ltd (electronics), 20 employees, turnover £1-2m.

DRB Engineering (pressings), 250 employees, turnover £5-10m

Barkley Plastics (tools, mouldings), 150 employees, £6m turnover

Reg Vardy (three Rover dealerships), 5,115 employees, owed £600,000.

Pendragon (15 Rover dealerships). Expects minor impact, 5,900 employees

· Birmingham Chamber of Commerce says 200 companies have so far contacted its Rover helpline on 0121 607 0121.