CORRECTED - BRIEF-3I says total Q1 investment up 10% to 775 mln stg

(Corrects headline to Q1 from H1)

LONDON, July 9 (Reuters) - 3I Group Plc (III.L: Quote, Profile, Research): * 3i invested £428 million (2007: £591 million) during the three months ended 30 June 2008. A further £347 million (2007: £111 million) was invested on behalf of funds managed or advised by 3i during the equivalent period, bringing total investment for the period to £775 million (2007: £702 million). * The mid-market has remained open over the first three months of the year, providing both investment opportunities and continued realisations despite the challenging economic outlook * In good position to deal with what continues to be an uncertain economic environment

(Editing by Erica Billingham)