It is a pleasure to serve under your chairmanship, Mr Betts. I congratulate the hon. Member for St Albans (Mrs Main) on securing this important debate. She was right that the matter of stamp duty has not been debated very much from a principled position; we have had a number of debates in proceedings on Finance Bills about technical changes that the Government have introduced to stamp duty, particularly on the annual tax on enveloped dwellings, but we have only rarely discussed the issue in the manner that we have today. Her securing of this debate has allowed some important issues to be raised.
The hon. Lady said that she hoped that we could move away from politics. I am not sure about that, as taxation and tax issues are perhaps politics in its purest form, but I accept her point about partisanship in our approach to this debate. People across the country, in constituencies of Conservative, Labour and Liberal Democrat Members alike, are all affected in various ways by stamp duty and the rising cost of housing. Her argument about the impact in London and the south-east on people on more modest incomes was particularly well made.
The hon. Member for Esher and Walton (Mr Raab) and other Members discussed the slab structure that is a particularly problematic feature of this tax. Many commentators have called for reform of that structure. He also raised our mansion tax policy, so I hope you will forgive me, Mr Betts, if I take a moment to clarify the details of our proposals.
I make no apology for our policy to levy a mansion tax on properties worth £2 million or more. Let me be clear: only properties worth over £2 million would be affected by our proposals and that limit would be raised each year, either in line with the overall rate of inflation or—and there is a strong case for this—in line with the rise in house prices, to make sure that more modest properties were not brought into the scope of the tax.