Irn Bru maker AG Barr is forecast to report an increase in first half sales on Tuesday, driven by improved margins.The Scottish manufacturer of softdrinks indicated in July that sales would rose 5.6% to £135m."Despite competitive markets, management has been happy enough regarding margin trends (with modest progress expected this FY), although August weather was clearly a disappointment," said Numis Securities.Final results from fellow FTSE 250-listed firm Close Brothers are also due along with interims from Faroe Petroleum.On the macro-economic front manufacturing purchasing managers' index (PMI) figures will dominate the agenda. Markit releases PMIs on Germany, France, the Eurozone and the US.HSBC will early on unveil PMI in China, which comes after the nation's finance minister said the government would not change policy to address weak economic data.Tuesday 23 SeptemberINTERIMSAA , Air Partner, Augean, Barr (A.G.), Centralnic Group , Cupid, Dolphin Capital Investors Ltd, Faroe Petroleum, GLI Finance Limited, Highland Gold Mining Ltd., Horizon Discovery Group, KBC Advanced Technologies, NAHL Group, NetScientificQUARTERLY EX-DIVIDEND DATETotal SAINTERNATIONAL ECONOMIC ANNOUNCEMENTSConsumer Confidence (US) (15:00)House Price Index (US) (15:00)FINALSClose Brothers Group, Netcall, RegenersisEGMSBank Audi S.A.L. GDR (Repr 1'Com'Shr Lbp1299)(Reg S)AGMSCity of London Group, F&C Managed Portfolio Trust Growth Shares, F&C Managed Portfolio Trust Income Shares, Marwyn Management Partners, Puma High Income VCT , Puma Vct VII, PZ Cussons, Scientific Digital Imaging, Sirius Minerals, WYGUK ECONOMIC ANNOUNCEMENTSBBA Mortgage Lending Figures (09:30)Public Sector Finances (09:30)FINAL DIVIDEND PAYMENT DATEBHP Billiton, Northgate