BUZZ-Lamprell: worst day in nearly 3 yrs on revenue warning
** Oil rig builder Lamprell -11.6 pct & set for biggest one-day drop since Jan 2015
** Co provides bleak revenue forecast citing lower activity levels across the industry
** Top faller on FTSE Small Cap index in volume 3x the 30-day daily avg by 0718 GMT
** Co cuts FY 2017 rev guidance; says revenue expectations for 2018 are around 10% lower than 2017, does not expect to see revenue growth until 2019
** Investec (LSE: INVP.L - news) cuts rating to 'hold' from 'buy'; cuts TP to £81 vs £131
** Investec: "We take a more cautious view than management guidance on revenue due to lack of visibility in both FY17E and FY18E"