Given the frustratingly disappointing outcome of Rio and the Crisis of Investor Confidence in solar PV, onshore wind and nuclear in Britain, is it not even more important that the Deputy Prime Minister joins the growing cross-party support for the Severn barrage, which would generate 5% of the electricity in Britain and create nearly 40,000 jobs - a green project that will deliver the Government's renewable energy commitments?

Those astonishing falls clearly represent a Crisis of Investor Confidence in our economy and indicate that investors anticipate a significant shift on growth in the UK economy.