Outsourcing firm Serco updates the market on third quarter trading and has a hard act to follow after sector peer Capita's upbeat statement on Tuerday.At the halfway point of the year, Serco announced a 2% like-for-like decline in revenue but said this should turn round in the second half to an 8% improvement. Consensus forecasts require an additional £34m organic operating profits increase in the second half (H2), Peel Hunt notes. "We can see £27m of the uplift leaving an additional £7m of profits to be delivered in H2 - a potential shortfall of up to 4%," the broker said,"While any profit short fall in 2012 is likely to be small, the delivery of H2expectations is vital in regard to investor confidence in the ability of Serco to achieve the acceleration in organic revenue growth rates anticipated by analyst forecasts from H2 2012 onwards," suggested Peel Hunt's Christopher Bamberry.INTERIMS London Stock Exchange Group, Record INTERIM DIVIDEND PAYMENT DATE Aviva, British Polythene Industries, Hunting, Intertek Group, Kerry Group 'A' Shares, Kingfisher, Lombard Risk Management, M&C Saatchi, Octopus Apollo VCT, S & U, Zhejiang Expressway Co 'H' Shares INTERNATIONAL ECONOMIC ANNOUNCEMENTS Balance of Trade (EU) (10:00) Capacity Utilisation (US) (16:15) Current Account (EU) (09:00) Industrial Production (US) (16:15) New Car Registrations (EU) (10:00) GMS Tangiers Petroleum Ltd (DI) IMSS Amec, Aegis, Clarke (T.), Lavendon, New Britain Palm Oil, Paddy Power, Rotork, Serco, Ultra Electronics Holdings SPECIAL DIVIDEND PAYMENT DATE Octopus Eclipse VCT 1, Octopus Eclipse VCT 2, Octopus Eclipse VCT 3, Octopus Eclipse VCT 4 AGMS Albemarle & Bond Holdings, Allergy Therapeutics, Cash Converters International Ltd, Dunelm Group, Matchtech Group, Nyota Minerals Ltd., Ultimate Finance Group FINAL DIVIDEND PAYMENT DATE Animalcare Group, British Sky Broadcasting Group, Galliford Try, Go-Ahead Group, Goldplat, Hays, Strategic Equity Capital, Wilmington GroupJH