BANGALORE, May 14 (Reuters) - ** UK investment firm 3i Group III.L shares plunge 20% to 1,931 pence, lowest level since Aug 2023 and record one-day fall
** Biggest loser on FTSE 100 .FTSE, which is up 0.1%
** Key portfolio company Action's like-for-like sales growth slowed to 2.4% in 19 weeks to May 10 vs 6.8% year ago
** 3i blames "consumer caution in France, lower traffic in Germany" since Middle East tensions worsened end-March
** "We think that Action has left itself with a lot to do in H2 to meet its guidance" - RBC Europe Limited analyst
** YTD, as of last close, 3i down nearly 26% vs FTSE 100's 4% gain
(Reporting by Amna Mariyam)
((amna.mariyam@thomsonreuters.com))