Goals from Jon Stead, Brett Pitman and Jamal Campbell-Ryce ended the Tigers` 17-game unbeaten away run in the npower Championship.
"I thought the attitude of the players was first class. We all wanted to produce a display worthy of the chairman's last game and that's what happened," said Millen. "To have reached 60 points after earning just six from our first 11 games offers great encouragement for next season.
"We scored two early goals and I knew that if we made a good start it could knock the heart out of Hull in a final game where they didn't have much to play for.
"It was nice to do our end-of-season lap of honour with the chairman on the back of such a good win and I believe we can be a promotion force next season with the right additions during the summer."
Lansdown is stepping down after 10 years as chairman but will remain the club's major benefactor as their majority shareholder, he said: "I couldn't have wished for a better send-off.
Source: PA
Source: PA