The UK should have a progressive and effective tax system, in which the tax gap (including but not limited to tax avoidance) is tackled as an absolute priority, and the costs of contributing to tax revenues should be shared in relation to ability to pay, so that wealth is taxed more effectively and the richest in society pay a higher proportion of their income as tax as the poorest (including all taxes, not just income tax).
For more on taxation, see our sister organisation, TaxWatch.