 aLLIaNCE Trust chief executive Katherine Garrett-Cox has ended the Dundee investment company s four-year experiment with private equity by announcing the closure of the ?110m unit.  Edinburgh-based alliance Trust Equity Partners (aTEP), which has its roots in the British Linen bank, will be run down within months.  Three of its six-strong team have already been laid off. The remaining three will stay with the business until they sell the remaining investments.  The move is i 