Department store Debenhams is a top riser ahead of tomorrow's interim management statement, but engineer Weir, which also updates tomorrow, is the heaviest faller. With oil at a 15-month high, shares in Lamprell, the provider of specialist engineering services to oil and gas firms, are higher.FTSE 250 - RisersRenishaw (RSW) 601.50p +5.53%Lamprell (LAM) 211.00p +4.87%BlueBay Asset Management (BBAY) 347.80p +4.60%St James's Place (STJ) 267.70p +4.57%BSS Group (BTSM) 282.60p +4.28%Interserve (IRV) 228.10p +4.25%Dechra Pharmaceuticals (DPH) 493.00p +4.23%Filtrona PLC (FLTR) 190.10p +3.77%Domino's Pizza UK & IRL (DOM) 324.60p +3.57%Debenhams (DEB) 77.95p +3.52%FTSE 250 - FallersWeir Group (WEIR) 798.50p -4.03%Redrow (RDW) 138.60p -3.95%Imagination Technologies (IMG) 268.90p -3.62%Carphone Warehouse Group (CPW) 192.00p -2.98%Shanks Group (SKS) 124.50p -2.73%Charter International (CHTR) 768.00p -2.35%Close Brothers Group (CBG) 714.00p -2.12%Mondi (MNDI) 371.10p -2.11%Persimmon (PSN) 481.10p -2.08%DS Smith (SMDS) 125.40p -2.03%