Precision tool maker Renishaw's plummeted on Thursday after the firm admitted that revenue growth in the three months ended 30th September was lower than planned. Shares dropped over 18% after the firm said that revenues rose by just 15% in the first quarter to £70.5m, while pre-tax profit dropped 10%.In contrast, Mr Kipling cakes manufacturer Premier Foods was the high riser, gaining 6% a week after warning on full-year profits. The share price is attempting to recover after sinking 58% over the last seven days.Cash and carry group Booker was heading north after demonstrating its resilience in the tough economic climate with a 22% rise in pre-tax interim profits.Ladbrokes, the bookmakers which recently walked away from a Sportingbet takeover, rose strongly after seeing net revenue rise 2.5% in the three months to the end of September. Newsagent WH Smith was in the end after like-for-like sales dropped 5% in the year to the end of August. FTSE 250 - RisersPremier Foods (PFD) 4.00p +5.73%Regus (RGU) 70.20p +4.78%Oxford Instruments (OXIG) 834.00p +3.99%Booker Group (BOK) 76.20p +3.67%Sports Direct International (SPD) 229.20p +3.43%Ladbrokes (LAD) 132.10p +3.20%Domino Printing Sciences (DNO) 488.90p +3.06%BH Global Ltd. USD Shares (BHGU) 12.04 +2.47%Imagination Technologies Group (IMG) 455.40p +2.34%Home Retail Group (HOME) 134.60p +2.28%FTSE 250 - FallersRenishaw (RSW) 839.50p -18.34%Mitchells & Butlers (MAB) 225.10p -10.85%Aquarius Platinum Ltd. (AQP) 193.30p -5.66%Ferrexpo (FXPO) 313.60p -4.97%Exillon Energy (EXI) 253.80p -4.23%Barratt Developments (BDEV) 89.85p -4.11%Morgan Crucible Co (MGCR) 266.40p -3.55%Victrex (VCT) 1,160.00p -3.41%F&C Asset Management (FCAM) 62.90p -3.31%Spectris (SXS) 1,173.00p -3.14%NR