The figures the hon. Gentleman chose to use were, I think, a range between £250,000 and £300,000, and he says there are 15 properties in that category. Of course, stamp duty kicks in at £125,000, so it is the range from £125,000 to £300,000 that we would actually be considering in that example.
First-time buyers are typically more cash-constrained than other buyers, and stamp duty requires cash up front, on top of a deposit and conveyancing fees, for purchases over £125,000. The Government think it is right to reduce the up-front costs that first-time buyers need to pay, giving them an advantage over the rest of the market.