Industrial materials maker Morgan Crucible was falling despite sticking to its full-year expectations. The firm said revenue in the first four months of 2012 at reported rates was marginally below the comparable period last year. The firm later announced that its Chairman Tim Stevenson will retire at the end of July. Meanwhile, Exillon Energy saw average production slip in April, but shares edged higher after it revealed that its financial performance has been better than expected, with the average selling price of oil ahead of the budgeted level. Galliford Try, a construction group, saw its shares take a dive despite being awarded a contract to build a new water treatment works in Lincolnshire. The £36m contract was awarded by Anglian Water who have comissioned the build to enable water from the River Trent to be treated at a downstream location for the first time. FTSE 250 - RisersInvensys (ISYS) 215.00p +6.07%Daejan Holdings (DJAN) 3,200.00p +4.92%Hansteen Holdings (HSTN) 73.75p +3.87%Talvivaara Mining Company (TALV) 161.70p +2.99%Derwent London (DLN) 1,779.00p +2.65%SEGRO (SGRO) 220.80p +2.46%Cable & Wireless Worldwide (CW.) 33.47p +2.17%Shaftesbury (SHB) 523.00p +1.85%Big Yellow Group (BYG) 307.00p +1.79%London & Stamford Property (LSP) 110.80p +1.65%FTSE 250 - FallersNew World Resources A Shares (NWR) 337.70p -12.22%Petra Diamonds Ltd.(DI) (PDL) 127.10p -9.86%Home Retail Group (HOME) 73.40p -9.66%Imagination Technologies Group (IMG) 552.00p -9.66%Ferrexpo (FXPO) 251.00p -7.82%Morgan Crucible Co (MGCR) 287.60p -7.52%Aquarius Platinum Ltd. (AQP) 113.00p -7.30%Centamin (DI) (CEY) 61.35p -6.90%Renishaw (RSW) 1,330.00p -6.60%Cape (CIU) 362.50p -6.35%NR