Union power

[mtread]

Erm .......  I think you will find that since its last little 'problems' the Co-Op bank is no longer a cooperative, owned by its members  :rolleyes
Nearest comparison is a Building Society like the Nationwide. But anyway they are all members co-operatives, not workers co-operatives.
As a customer of the Nationwide, you own part of the organisation. As a customer of Waitrose you don't.
As an employee of the Nationwide, you don't own part of the organisation. As an employee of Waitrose you do.