 Admiral Group PLCs LON:ADM shares are likely to tumble, reckons Credit Suisse, as the motor and home insurer is expected to struggle competitively this year and with new regulatory guidelines on auto-renewals. The Swiss investment bank put out a note today with a share price target of 2,300p compared to the last close at 3,155p, a fall of 27, as well as reiterating its underperform rating. 