(Bloomberg) -- UK government borrowing costs rose to the highest level in decades relative to Germany’s, as traders grew increasingly skeptical over how much more easing the Bank of England will manage to deliver next year.Most Read from BloombergHow California Sees the World, and ItselfHong Kong's Expat Party Hub Reshaped by Chinese InfluxLondon’s Tube Fares Are Set to Rise by 4.6% Next YearThe spread between UK and German 10-year bond yields widened to 229 basis points, the highest on a closin