BUZZ-Whitbread: bottom of FTSE 100 on Costa Q2 disappointment

** Leisure giant Whitbread (Frankfurt: WHF4.F - news) 's shares down 2.5 pct, bottom of FTSE 100, as Costa unit results weigh

** Co says Costa LFL sales slow to 2 pct in Q2 from 2.6 pct in Q1, adds margins contracted 170 basis points compared to a year earlier

** Costa reports H1 underlying profit of 64 mln stg; Jefferies flags consensus at 74 mln stg and says unit might provide cause for concern

** Shares (Berlin: DI6.BE - news) fell to their lowest in 3 mths before paring losses, bottom of the Stoxx 600 Travel and Leisure Index

** A third of co's 30-day avg vols gone through in the first 45 minutes of trade (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)