The company I had did a lot of work for BLMC at Cowley and Longbridge and I got to know a lot of their senior managers.
Some were strong and honest individuals, but others were weak bribe-takers who just turned up to get their inflated salaries. They were bad at their jobs and the trades unions were obstructive and foolish.
They were more interested in keeping plants going, even producing model ranges which really only competed with themselves. Once it became ARG or Austin-Rover they had, for example, the Rover 2000/2200/3500 which had, as its nearest competitor the Triumph 2000/2500/2500TC. Both nice cars but very similar. Then the Spitfire's nearest competitor was the Sprite/Midget and the GT6 had the MGB-GT as its nearest rival. And they all had different engines.
But if some rationalisation was suggested, the Unions would call a strike and the management would back down, knowing that the Labour Gov't would put more cash in to keep their union friends happy.
It was doomed from a long way back.
It's not surprising that FoMoCo did their 'due diligence' then walked away in despair. Who in their right minds would want to have bought that pile of s**t.