A fresh rental market survey spanning five major cities across England and Scotland has laid bare a market that is fragmenting sharply along regional lines, with tenant demand and rental growth diverging in ways that will reshape investment strategy over the next year. The research, covering London, Manchester, Birmingham, Glasgow and Edinburgh, points to a rental sector still under significant strain from constrained supply, but one where the pressure points are shifting northwards and, notably, across the border into Scotland's two largest cities.