Speaking of Cadbury, here's another company that would be dead to me if they weren't so completely unavoidable: Kraft.
Cadbury's had planned to close the Somerdale factory at Keynsham, but a key part of Kraft's bid for the company was a solemn pledge they made, over and over again, that the factory would remain open, not a single job lost, blah blah blah. A week after they took over, suddenly it became 'financially unviable' to keep it open, and all its production was transferred to Poland. 400 jobs gone. The lying bastids never had the slightest intention of keeping it going.