** Office space provider's shares down 5 pct, top FTSEmidcap loser after Investec cuts rating to "hold" from"buy", raises PT to 295p from 260p
** Investec raises PT in anticipation of good trading updateon Aug 25, but says share strength has priced in much of stock'supside
** Stock has gained 31.5 pct YTD, compared with an 8 pctrise by FTSE midcaps and a 5.6 pct rise in the FTSE 350 SupportServices Index
** Worst day for stock in 3 mths, with half of its daily avgvolumes going through in the first 45 mins of trade (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)