What is the lowest investment grade rating for Fitch? What is the forecast for DERWENT LONDON share price? What is the EPS of Derwent London? What is social value in the London Plan? What is Derwent London's rating? What is DERWENT LONDON's P/E ratio? What is Derwent London social value? What is Derwent London plc? What is Derwent London Fitch rating? What does social value mean in business? What are the 4 pillars of social value? What are the 4 C's of sustainability? What are Derwent's growth prospects? What are Derwent London values? Is Derwent, London a reit? Is Derwent London plc a REIT? Does the UK have an AAA credit rating? Can social value be negative?