BUZZ-Senior: Hits 7-month low after lacklustre update

** Aircraft parts maker's shares down as much as 3.3 pct after saying H1 adjusted pretax profit rose 4 pct (fell 1 pct on a constant currency basis)

** Adjusted operating margin in its biggest unit, Aerospace, fell 170 basis points

** Stock biggest loser on FTSE 350 Aerospace and Defense Index in heavy volumes

** Worst day for stock in two months, with its low of 268.6 pence last seen in December

** Jefferies cuts PT on stock to 320p from 335p, keeps "buy" rating (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)