By Lars Mucklejohn Britain’s mortgage price war has shown signs of slowing as macroeconomic uncertainty casts doubt on the outlook for interest rate cuts and a wider rebound. Home loan prices have shot down in recent weeks as dozens of lenders offer better deals to battle for business in a market shrunk by economic turmoil. Nationwide, the country’s largest building society, this week slashed some of its rates by as much as 0.81 per cent and debuted a new range of fixed and tracker rate products. The changes mark the first time Nationwide has offered sub-four per cent rates in eight months as …