BMW executives yesterday met members of the Towers consortium to clarify details of its rival bid for Rover. The move came as unions prepare for a last-ditch visit to Munich next week to press BMW to drop the bid by the venture capital group, Alchemy Partners, in favour of John Towers, who plans high volume car production. BMW's period of exclusive talks with Alchemy ends next Friday and the German company has promised to give full consideration to the bid by Mr Towers, former Rover chief executive. But the fact that the details of the Towers' bid, and the nature of its financial backing, remain unclear raises fears it will not beat Alchemy. The bid was outlined apparently within a three-page letter rather than in a more comprehensive document. BMW yesterday sought to clarify its position on how many workers it would continue to employ in the West Midlands following the sale of the Rover car plant at Longbridge. The number would be about 2,000 building engines and gearboxes for BMW cars. They would be part of an operation, called Midland Powertrain, that would be based at an existing gearbox plant and at a new engine works to be opened later this year.