Scandal-hit bank Barclays is to appoint City veteran Sir David Walker as its new Chairman. Walker will join the board on September 1st before replacing the outgoing Chairman, Marcus Agius, in November.Sector peer Standard Chartered, which has been embroiled in a scandal over its wholly-owned subsidiary Standard Chartered Bank, is under a little pressure today as ratings agency Fitch is making noises about reviewing the bank's AA- credit rating. Elsewhere in the financial sector, insurance titan Prudential is, not for the first time, thanking its Asian operations for a solid first-half performance. Although the figures failed to wow the market - IFRS operating profit was up 13% to £1,162m from £1,028m a year earlier, beating broker Panmure Gordon's forecast for IFRS operating profit of £1,095m - performance in Asia was a bright spot, with IFRS operating profit up 21% year-on-year.FTSE 100 - RisersBarclays (BARC) 182.90p +2.21%Aviva (AV.) 322.60p +1.86%Kingfisher (KGF) 288.50p +1.33%ICAP (IAP) 335.20p +1.30%United Utilities Group (UU.) 690.00p +1.17%Anglo American (AAL) 2,043.00p +0.91%Schroders (SDR) 1,404.00p +0.79%GKN (GKN) 217.10p +0.56%BT Group (BT.A) 217.50p +0.55%Babcock International Group (BAB) 899.00p +0.50%FTSE 100 - FallersBunzl (BNZL) 1,106.00p -5.23%IMI (IMI) 884.00p -1.72%Royal Bank of Scotland Group (RBS) 222.20p -1.68%ARM Holdings (ARM) 571.50p -1.64%Standard Chartered (STAN) 1,342.00p -1.54%Smiths Group (SMIN) 1,044.00p -1.23%International Consolidated Airlines Group SA (CDI) (IAG) 149.60p -1.19%Associated British Foods (ABF) 1,280.00p -1.16%Reed Elsevier (REL) 562.00p -1.14%Lloyds Banking Group (LLOY) 31.26p -1.08%NR