By Maria Ward-Brennan Admiral Group has reported a 43 per cent jump in turnover in the first half of its financial year thanks to a strong performance at its UK motor insurance division. The group reported an overall turnover of £3.2bn for the six months to 30 June. Profit before tax also jumped. The figure rose 32 per cent to £310m. The group revealed the results were driven by a “record 5.5m vehicles on cover in the UK and nearly half a million more customers across other product lines in the UK”. Admiral’s board declared an interim dividend of 71p per share, up 35 per cent from the same per…