You don't see that accepting free sandwiches from a company that you're accusing of tax avoidance could be viewed as having double standards?
Do you work for a right-wing tabloid, or have you just been conditioned?
As I said before, there are no tax-avoidance issues with Costa (quite the opposite - they got a top mark (meaning good performance) by Ethical Consumer for "potential for tax avoidance". Not that it would be especially relevant in the circumstances.