BUZZ-Royal Mail: UBS upgrades on valuation
** Royal Mail (LSE: RMG.L - news) up 2.5 pct after UBS (LSE: 0QNR.L - news) upgrades to "neutral", near top of FTSE 250
** Broker says the announced strike has led to share price underperformance & there is too much uncertainty to become positive on RMG but valuation is discounting known risks
** Stock at its highest since beginning of September