Every firm or individual that engages in tax avoidance or tax evasion should be excluded from Corona relief. This also applies to firms using tax havens and other measures to avoid paying the full tax due by UK based firms and organisations.
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Those who refuse to pay their dues should not be allowed to benefit from the same dues. If you do not pay the full tax every UK based firm would pay when abiding to the law, you should not be able to claim any Corona relief whatsoever.