@Nauraushaun It was a bit of a mess though. Longbridge had always been the small car plant, Cowley was the large car plant, so the entire new MINI production line was installed at Longbridge - entirely new paint shop, totally rebuilt car assembly building, then Rover Group was split up just before it could be switched on. They had to disassemble the Rover 75 line at Cowley and truck it to Longbridge to reassemble there, and move the MINI tooling over to Cowley, while BMW also had to contract with MG Rover to continue building the classic Mini for a few more months to bridge the gap.
BMW opted to keep the Cowley plant because it was smaller, and they didn't think they'd need a big space for expected MINI volume, but they ended up outgrowing it fast and can't expand because it's hemmed in with development