Indeed, the unions were pretty much the reason that the Pheonix consortium took over. BMW had a rescue/recovery plan that involved spending at Longbridge to modernise the archaic processes and practices but that would have also meant job losses (circa 50% iirc). To put into perspective why that was needed, comparing Longbridge with the Nissan plant in Sunderland shows that each car built at longbridge took double the man hours of sunderland, with an additional issue that the cars were also very badly built in comparison due to a lack of modern computer controlled technology producing far better consistency than humans can.
The unions objected, the government agreed, there were strike threats, and the pheonix consortium popped up out of nowhere, offering no job losses and no need to reform and offered to take the business, the government supported it (and put pressure on the Germans to accept it) and Rover was sold.
The problem was always there, but the one chance Rover really had was squandered, and now instead of 50% of employees at longbridge losing their jobs, 100% of rover employees countrywide were made redundant... A victory? I don't think so...