Premier Oil was also making gains after saying that an exploration well on the Luno II prospect in PL 359 (30% owned) had found a "potential significant discovery". Hays got a boost after JP Morgan shifted its target price from 83.40p to 88p, retaining a neutral rating. Communications technology group Spirent was hit by a UBS downgrade from 'buy' to 'neutral', after the broker said that the recovery is "likely to take longer than previously anticipated". FTSE 250 - RisersAfren (AFR) 134.70p +5.81%Premier Oil (PMO) 379.20p +4.52%Petra Diamonds Ltd.(DI) (PDL) 116.90p +3.45%Genus (GNS) 1,468.00p +3.31%Homeserve (HSV) 191.60p +3.23%Filtrona PLC (FLTR) 712.00p +3.04%Hays (HAS) 95.00p +2.93%Kenmare Resources (KMR) 28.10p +2.93%African Barrick Gold (ABG) 195.70p +2.89%Capital & Counties Properties (CAPC) 274.50p +2.85%FTSE 250 - FallersAnite (AIE) 113.70p -5.49%Spirent Communications (SPT) 134.80p -4.53%Heritage Oil (HOIL) 158.40p -2.94%Tullett Prebon (TLPR) 244.70p -2.74%Pace (PIC) 224.50p -2.69%F&C Asset Management (FCAM) 97.40p -2.45%LondonMetric Property (LMP) 106.00p -2.39%Barr (A.G.) (BAG) 534.00p -2.38%Dignity (DTY) 1,371.00p -2.28%SDL (SDL) 394.90p -2.25%NR