By Ali Lyon One of Mission Group’s major shareholders has been advised to reject a bid by competing digital marketing agency Brave Bison, calling the offer “highly unattractive”. Logistics Development Group (LDG), which is an AIM investing company that owns over 10 per cent of the Mission, was told by its investment manager, DBAY Advisors, not to take any action in response to the approach. The advice comes days after Mission Group, an AIM-listed marketing agency that works with the likes of Ted Baker and lastminute.com, was the subject of a £27m takeover bid from the owners of Steven Bartlett…