The "Social Contract"

I am sorry if the term I used to describe this post is unfamiliar to you, let me explain what I mean by the "social Contract".  Companies set up in this country to make money, they do not do it because they are altruistic or 'nice', but to make money on the money they invested.  That is an accepted fact.
Lots of people work in the public sector and buy their shopping in Tesco, and drink coffee in Starbucks, and have mobile phones on Vodaphone, and these companies make money.
In order for the country to continue to pay it's doctors, nurses, teachers, soldiers, social workers, police, bin collectors, make sure the roads are in a good state of repair etc. etc. they need to have some income.  All (?) the workers in this country pay tax and national insurance to the Government, and so should the companies that take the money from the large number of people paid for by the public purse.  However, some companies use tax-avoidance schemes so that they do not have to pay their fair share of corporation tax and can instead pay their directors more money.  This is what I mean about the "Social Contract".  If Starbucks makes money from the tax payers in this country, shouldn't they be paying their fair share as well?
Suggestion: next time you visit Starbucks, when they ask you for your name to put on the cup, say "Angry Tax Payer!"  Or better still, do not go there at all, until they start to pay their fair share.
My final point.  If these large corporations pay their full whack, would so many doctors, nurses, social workers, bin collectors, police need to lose their jobs?