Very simple.
38 degrees - publish list of companies who avoid tax and/or don't pay living wage, encourage a complete boycott by all members.
Then publish list of companies who do pay tax/living wage - encourage members to use them instead.
Why is this important?
We've been trying to get companies to pay tax and a living wage for years - unsuccessfully. It's clear we have to hit these companies in the only place they will listen - their wallets.