** British engineer Cobham rises 1.8 pct afterupgrade to "overweight" from "neutral" by JP Morgan
** Broker looking to play mean reversion after heavy YTDunderperformance
** Trades on fwd P/E of 11.8x v 15x for aerospace peer group
** Co among the top risers on FTSE 250 midcap index
** Stock off YTD lows but still down 18 pct in 2015
** Of the 19 analysts covering the company, 12 have a "hold"rating, 4 rate it a "strong buy", 1 rate it a "buy" whileremaining two have a "sell" and "strong sell" rating each (RM: aastha.agnihotri.thomsonreuters.com@reuters.net)