Aligot with red wine braised beef sausages

  Ingredients For the aligot 1kg/2lb 4oz floury potatoes, such as Maris Piper or Desiree, peeled and roughly chopped into equal-sized pieces 3 garlic cloves, crushed 250ml/9fl oz full-fat milk 100g/3½oz unsalted butter 100ml/3½fl oz double cream 250g/9oz Lancashire cheese, grated 250g/9oz gruyère, …