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TRADING UPDATES: Bidstack drops guidance; Air Partner trading picks up


TRADING UPDATES: CML Microsystems doubles dividend; Helical in profit


IN BRIEF: Helical sees rent collection improve; June misses prediction


By Joice Alves and Sujata RaoLONDON, Aug 16 (Reuters) - This year's unprecedented private equity buying spree in Britain is causing unease among pol...