If Scotland wishes to impose higher taxes, the Union has less of a problem with that—unless it chooses to impose higher tax rates which collect less revenue, because those could be a problem for the Union as a whole—but it would be a problem for Scotland if it had to collect higher tax levels and it did not get all the money back; I would have thought it would want to get all the extra money back that it was collecting. Full fiscal autonomy means it would take responsibility for both raising the money and spending it. If Scotland wishes to spend more under fiscal autonomy, she can do so if she has a magic way of getting more money off people through either higher or lower tax rates, whichever work in the particular fiscal circumstances.
We need to have working papers on how full fiscal devolution might work and whether it is truly full fiscal devolution, because if we are going to full fiscal devolution, England will want guarantees that we are no longer acting as a buffer or subsiding the Scottish settlement, just as Scotland will want guarantees that she has got a fair deal and is capturing the benefits of her fiscal independence. If we go for a mixed system, which is where we currently are with the real debate between the Smith commission, the pro-Union parties and the SNP, there is a lot to be worked out, and I hope that at some point those on the Treasury Bench will share some of their thinking with the House.