Not so much the management, they made the best of a bad fist for decades. The blame for the start of the fall can be put down to HM Government for 2 factors;
Originally Posted by marcello.brussard
During WW2 Ilford were forced to put their research into colour technology on hold and concentrate on monochrome materials of use to the war effort (aerial, infra-red etc).
After the war when they had picked up on colour again, (early '60's I think) they had to abandon their colour print system, as the monopolies commission would not condone a process that needed 'back to base' processing, and could not be operated by private labs.