Retailers are providing a boost on Wednesday, with Marks & Spencer performing best among the blue chips.The group saw a sharp drop in like-for-like sales of clothes and other non-food items in the 13 weeks to 2 April, though the fall wasn't as severe as expected and overall sales growth was maintained. Peel Hunt has upgraded the group from 'sell', to 'hold', saying "we see limited downside at this juncture".Peers Next and Kingfisher (owner of B&Q) are also wanted.Luxury brand Burberry is heading in the other direction, after Nomura kept its 'neutral' rating, saying that strong momentum is already priced into the shares.#Vedanta Resources is slightly higher after the acquisition of a majority stake in Cairn India looks to be progressing. The company's subsidiary, Sesa Goa, received clearance from the Indian authorities to send out offer letters. Banking giants Lloyds, Royal Bank of Scotland, Barclays and HSBC are firmer.---bcFTSE 100 - RisersMarks & Spencer Group (MKS) 360.10p +5.85%Lloyds Banking Group (LLOY) 62.00p +3.99%TUI Travel (TT.) 236.90p +3.68%Next (NXT) 2,103.00p +3.55%International Power (IPR) 322.00p +3.24%Royal Bank of Scotland Group (RBS) 43.01p +3.22%Barclays (BARC) 294.20p +2.60%HSBC Holdings (HSBA) 664.00p +2.56%Kingfisher (KGF) 264.00p +2.33%Legal & General Group (LGEN) 120.90p +2.03%FTSE 100 - FallersPearson (PSON) 1,118.00p -2.44%Centrica (CNA) 323.30p -1.94%Invensys (ISYS) 341.10p -0.84%British Land Co (BLND) 556.50p -0.71%Cairn Energy (CNE) 466.50p -0.68%Burberry Group (BRBY) 1,202.00p -0.66%Severn Trent (SVT) 1,442.00p -0.62%SABMiller (SAB) 2,257.50p -0.57%BP (BP.) 472.30p -0.54%Petrofac Ltd. (PFC) 1,531.00p -0.46%