** Flybe Group shares down 25 pct in volume afterStobart says it has scrapped plans to buy the company
** Stobart says Flybe rejected a bid, and it has decidedagainst making a higher offer
** Flybe has been hit by faltering demand and co's shareslost almost a third of their value in 2017
** Worst day for stock in >3 years
** Stobart -1.3 pct(harish.bhaskar.thomsonreuters.com@reuters.net)