By Charlie Conchie A London pension fund has defended the way it invests its cash after City figures sounded the alarm over the dearth of retirement money flowing onto the London Stock Exchange. The London Pensions Fund Authority (LPFA), a £7.7bn local government pension fund scheme based in the capital, won plaudits last month when it published a deepdive into the geographic make-up and impact of its investment portfolio. However, the amount of UK-listed companies backed by the LPFA has revived concerns over the amount of cash that domestic pension funds are channelling into London’s beleague…