By Jack Barnett London’s FTSE 100 today was dragged down by investors souring on middle-class favourite and online supermarket Ocado. The capital’s premier index fell 0.21 per cent to 7,369.44 points, while the domestically-focused mid-cap FTSE 250 index dropped 0.85 per cent to 19,455.88 points. Ocado’s shares plummeted to the bottom of the FTSE 100 today, taking the index down with it, eventually finishing nearly 17 per cent lower. It marks the end of a recent short-term boost to the firm’s shares after it announced it is entering the Asian market via a tie up with fellow supermarket Lotte. …