Why the government should act to close corporate tax loopholes

The title of the article says a lot: John Lewis chief calls on government to tax multinational companies properly:
The John Lewis Partnership boss, Andy Street said that there is an unfair advantage exercised by TNC's who are 'domiciled' abroad -often in tax havens and certainly for the purposes of aggressive tax avoidance. They have an unfair advantage over British-based rivals because of the foreign companies have low tax bills meaning that they can spend more on investment in research and development and begin to steal a march.

So if we want there to be British based employment, manufacturers etc, it would be because we'd like for our wealth not to be constantly being expatriated to tax havens and the global 'few'. If we allow this expatriation to continue, it is to consent in our own impoverishment. If we let it continue,  we're allowing corporate asset stripping of the nation.

The business case is the other side of this observation. If we value SMEs, we need to plot against the unfair advantage the combination of tax rules and existing wealth delivers to  the TNC's.  In principle it's the same as anti-monopoly legislation and policies: countering the accumulation of economic power because it tends towards rentier behaviour and the exploitation of others.