By Charlie Conchie Top pension fund managers risk neglecting London’s junior stock markets and have made only sluggish progress on a landmark pledge to inject some £75bn into growth companies by 2030, a London business body has said. The Mansion House Compact, a government-backed agreement signed last year by 11 pension managers worth around £400bn in assets, committed firms to investing five per cent of their assets to “unlisted equities” by 2030. Signatories of the deal last year include Aviva, Legal & General and Phoenix Group. Under the terms of the agreement, any private company or firm o…