By Elliot Gulliver-Needham Scottish Mortgage is no longer the most bought investment trust in the UK, according to the Interactive Investor Most Bought List, as the popular retail pick falls into second. The growth trust was eclipsed in September by Blackrock World Mining, a commodities-focused trust which is up 15 per cent in the last three weeks and was previously ninth on the list. Performance for Scottish Mortgage was particularly weak over the last three years, falling 39 per cent to a sector average of 14, but it has managed to make a comeback, growing 25 per cent in the last year. This …