(Sharecast News) - London's FTSE 250 index was down 1.14% at 19,481.51 in afternoon trade on Tuesday, with Victrex leading the way lower as markets fell back following an escalation in Sino-US trade tensions.The polymer solutions supplier was the top faller ahead of the release of its interim results next Monday, while Essentra dropped after a rating downgrade from 'buy' to 'hold' at Stifel, as analysts downgraded a slew of industrial distribution companies to reflect "a less aggressive view of the sustainability and robustness of economic prospects".CYBG fell following the weekend's news that a group representing more than 100 small businesses is suing its Clydesdale Bank, with the group alleging that fixed-rate loans from the bank came with interest rates had been inflated by hidden margins.William Hill dropped lower as analysts at Peel Hunt cut full-year profit before tax estimates by £5m, or 5%, to reflect "tough trading in Sweden", while Ferrexpo was also lower as analysts at HSBC cut the stock's price target from 340p to 275p.Finally, Telecom Plus was the top riser following a Telegraph article from AJ Bell's Russ Mould asserting that the business was "well set" for earnings and dividend increases due to "solid customer growth, a refinement of its energy supply agreement with npower and trouble at leading power supply rivals".Market MoversFTSE 250 (MCX) 19,481.51 -1.14%FTSE 250 - RisersTelecom Plus (TEP) 1,464.00p 2.66%Greggs (GRG) 1,828.00p 1.73%Greencore Group (GNC) 227.32p 1.62%AJ Bell (AJB) 455.00p 1.56%Polymetal International (POLY) 807.80p 1.56%TalkTalk Telecom Group (TALK) 123.60p 1.39%JD Sports Fashion (JD.) 637.80p 0.98%Great Portland Estates (GPOR) 762.60p 0.95%Drax Group (DRX) 329.60p 0.86%HarbourVest Global Private Equity Limited A Shs (HVPE) 1,520.00p 0.80%FTSE 250 - FallersVictrex plc (VCT) 2,282.00p -6.86%Essentra (ESNT) 393.80p -5.74%CYBG (CYBG) 194.20p -5.41%Premier Oil (PMO) 89.08p -4.73%Cairn Energy (CNE) 156.20p -4.58%William Hill (WMH) 148.30p -4.57%Ferrexpo (FXPO) 210.70p -4.44%Kaz Minerals (KAZ) 597.80p -4.11%Playtech (PTEC) 411.60p -3.97%Hastings Group Holdings (HSTG) 180.50p -3.94%