With little in the way of company news to move mid-cap stocks, business processing company Xchanging leads the risers, while aviation services group BBA Aviation is the heaviest faller.FTSE 250 - RisersXchanging (XCH) 227.00p +5.09%Interserve (IRV) 229.50p +4.94%HMV Group (HMV) 120.70p +4.05%DS Smith (SMDS) 83.50p +3.73%Savills (SVS) 365.80p +3.71%Babcock International Group (BAB) 479.90p +3.54%Greggs (GRG) 415.00p +3.23%Computacenter (CCC) 258.00p +3.20%Henderson Group (HGG) 119.20p +3.20%Shaftesbury (SHB) 368.00p +3.08%FTSE 250 - FallersBBA Aviation (BBA) 146.30p -4.69%Edinburgh UK Tracker Trust (EUK) 208.50p -4.18%Peter Hambro Mining (POG) 632.00p -3.51%Domino Printing (DNO) 258.00p -3.48%Spirent Communications (SPT) 73.80p -3.34%Mondi (MNDI) 269.90p -3.26%Regus (RGU) 75.05p -3.04%BH Global USD Shares (BHGU) 10.55000000 -2.76%Bodycote (BOY) 154.10p -2.71%Fidessa (FDSA) 1,158.00p -2.61%