"Let's assume an outstanding mortgage of £140,000 with repayment terms over 25 years. Adding 0.5% to the interest rate on a £140,000, 25-year repayment mortgage adds about £40 to the monthly payout. If Labour won again, bond yields are likely to rise quite quickly by about 0.5% to 1%, and this would pass through pretty much at par into mortgage rates. A full-blown Greek crisis would add 3% to rates or £240 per month to mortgage bills. This poster is based on a realistic 1.5% mortgage hike." (MORE HERE).