I think you are making 1 mistake in the calculation there, AC. you say "companies can not operate with out us".
When Sandra Day O'Conner (a USA Supreme Court Justice) retired she said something I have long known.
The test to see how much any one person will be missed is that you take a bucket full of water, add up to a kilo of sand, put your hand in the bucket and stir all you want, and then pull your hand out, the hole your hand leaves in the water will be equal to how much hole you will leave in the company.
I am firmly of the opinion that companies do not exist to create jobs for their employees, they exist to fill a need or demand their customers recognize.
All that said, on your side of the pond, what is the problem with joining "UNITE" (current name of the former TGWU)?