BUZZ-Brown Group: Up on broker upgrade
** Plus-size retailer Brown Group up as much as 2.4 pct after brokerage N+1 Singer raises to "buy" from "hold"
** Brokerage says recent weakness in stock is buying opportunity
** "Q2 likely to have been an improvement on Q1, and Q3 expected to be better still against soft comps"
** N+1 has target price of 355p on BWNG stock
** Stock among top gainers on FTSE 250 index, coming off 7 pct fall on Friday when Exane BNP Paribas cut target price to 300p and rated the stock "underperform" (abhiram.nandakumar.thomsonreuters.com@reuters.net)