Pressure was mounting on BMW last night to open full talks with the rival bidder for Rover as it emerged that the Towers plan could ensure production of up to 250,000 cars a year - compared with the 226,000 it made last year. The bid by Alchemy Partners, the venture capital firm which is in exclusive negotiations with BMW until April 28, envisages just 50,000 cars being built at Longbridge. This would have an enormous knock-on effect on the components industry, with forecasts of 45,000 job losses across suppliers and local economies.