By James Sproule A post Global Financial Crisis policy of zero interest rates has facilitated investments which deliver poor returns, writes James Sproule Productivity is often seen as the key for sustainable growth. But it is hardly a secret that Britain’s productivity is stuck in the doldrums – and has been so since the Global Financial Crisis (GFC) of 2007. Britain has not been alone in finding it difficult to generate any meaningful advances in productivity, but the UK’s record has been notably lamentable, lagging behind both Germany and France: we have ended up in the bottom half of the c…