In reply to Trangia:
Ok, so they lend 5x income, for couples or individuals that earn £50,000 a year and have a 25% deposit. So, if you want £250,000, you already need to have a £62,500 deposit. That suggests to me that you've been saving for a pretty long time already, so fairly comitted to actually buying somewhere, and used to making sacrifices towards that.
Given that repayments (according to the BBC) on that amount are going to be £1400 per month, it doesn't strike me as something that people are going to rush into.
Various other companies have been doing 5x income for a fair few years now, especially on Graduate schemes. The world has not ended, nor property prices crashed.
The BTL market has slowed down considerable, as prices have simply risen too high. Given a 10% depost, there needs to be a certain profit margin between mortgage and rental income before lenders will give you the money. This has been eroded so much, that in certain areas BTL is no longer possible.