How can we put the brakes on the ambitions of Rachel Reeves to find ways to tax us more? She has surrounded herself with advisers who back high tax, and when she gives speeches she is very careful to use coded phrases that leave the possibility of more, and higher, taxes on the table. Fortunately we can point to Scotland as an example of how leftist economics risk sending public finances into a tailspin. As a Scot, it gives me no pleasure to state it, but the destination of travel for Scotland’s public services must be to fall further behind the performance levels of the rest of the UK. Why? Because more of Scotland’s highest tax contributors will join those already choosing to move their tax domicile to England, ensuring a widening gap between budgeted and actual tax revenues, which in turn will ensure diminishing funds for quality public services. It is this lesson that Rachel Reeves and any other prospective chancellors must learn. When the top earning 10pc of UK taxpayers contribute 60pc of the revenues it is this group of people – who also happen to be the most mobile – that tax policy has to be careful...