London stocks plunged towards three month lows on Monday, as investors nervously anticipated further details of a fed rate hike on Wednesday and Greece's negotiations with its creditors collapsed abruptly.At 1500 BST, the FTSE 250 was trading 0.9% lower at 6.724.Shares in Standard Chartered dropped after Jefferies cut its price target from 722p to 656p and warned that the company may cut its dividend to bolster capital.Rolls-Royce was trading lower, despite winning contracts worth a total of $224m with the US Department of Defense to support US military branches and global air forces.Budget airline Easyjet nose-dived after RBC Capital Markets downgraded the stock to 'underperform' from 'outperform' and slashed its price target to 1,500p from 2,000p, noting that its positive outlook for summer has proved incorrect. "As summer is key, we see few positive catalysts until mid-2016, while easyJet faces a winter squeeze," said RBC.GKN dipped as news it had secured a major supply order from Boeing for its aerospace division failed to impress investors. It will provide components and subassemblies for Boeing's 737 MAX, 777X and 787 Dreamliner aircraft.Tesco was in the red, even as South Korean snack maker Orion announced that it was considering bidding for Tesco's South Korean unit, which is worth approximately £3.9bn. RisersSoco International (SIA) 194.10p +9.04%UK Commercial Property Trust (UKCM) 89.80p +1.58%Supergroup (SGP) 1,187.00p +1.45%Poundland Group (PLND) 303.50p +1.44%Synergy Health (SYR) 1,765.00p +1.38%Brown (N.) Group (BWNG) 348.10p +1.22%Zoopla Property Group (WI) (ZPLA) 262.70p +1.04%Hunting (HTG) 602.50p +0.92%Polymetal International (POLY) 543.50p +0.83%Jimmy Choo (CHOO) 165.40p +0.79%FallersTullett Prebon (TLPR) 371.40p -8.00%Ashmore Group (ASHM) 302.00p -4.52%Allied Minds (ALM) 571.00p -3.47%Indivior (INDV) 228.20p -3.26%Centamin (DI) (CEY) 64.05p -3.25%Crest Nicholson Holdings (CRST) 544.50p -3.20%Spire Healthcare Group (SPI) 333.00p -3.11%Victrex plc (VCT) 1,933.00p -3.06%Man Group (EMG) 160.60p -2.96%Dignity (DTY) 2,048.00p -2.89%