Ladbrokes slumped after JPMorgan Cazenove expressed concerns about potential regulatory restrictions on machine gaming, which could result in 'material downgrades and significant shop closures' at the bookmaker. Consumer products group PZ Cussons also took a hit after reporting that its first half suffered currency headwinds, limiting growth in revenues and profits. It was estimated that weakening currencies in Asia had a two percentage point impact on both the top and bottom line.Lonmin shareholders were reacting to news that the miner yesterday received a 48-hour notice from the Association of Mineworkers and Construction Union (AMCU) of its intention to strike.Meanwhile, Tanzania-focused miner African Barrick Gold rose after it beat its full fiscal-year guidance for gold production, which reached 641,931 ounces (sales: 649,742 ounces).Greencore Group rose strongly after Jefferies International initiated its coverage of the stock with a target price of 275p. It opened today at 239p. FTSE 250 - RisersOcado Group (OCDO) 536.00p +3.78%African Barrick Gold (ABG) 207.30p +3.34%Homeserve (HSV) 305.60p +2.58%Greencore Group (GNC) 243.90p +2.35%JD Sports Fashion (JD.) 1,650.00p +1.54%Pace (PIC) 353.00p +1.50%Atkins (WS) (ATK) 1,441.00p +1.48%IP Group (IPO) 175.00p +1.45%Barr (A.G.) (BAG) 598.50p +1.44%Booker Group (BOK) 157.30p +1.29%FTSE 250 - FallersLadbrokes (LAD) 159.80p -4.14%Ferrexpo (FXPO) 172.80p -4.00%Computacenter (CCC) 643.50p -3.74%PZ Cussons (PZC) 383.50p -3.21%Imagination Technologies Group (IMG) 202.40p -3.11%Lonmin (LMI) 316.10p -2.86%888 Holdings (888) 151.40p -2.45%Betfair Group (BET) 1,000.00p -2.34%Rathbone Brothers (RAT) 1,679.00p -2.27%Carillion (CLLN) 348.60p -2.22%NR