Brentford made it back to back wins for the first time this season as they claimed a 2-0 victory over Birmingham and their former players.
The overall contest was a scrappy one with the Bees having the better chances in the first half although Maikel Kieftenbeld struck the post from 40 yards.
Lasse Vibe forced Tomasz Kuszczak into some good saves as he worked the defence hard.
The game changed when Neal Maupay came on and the Frenchman won a penalty after he was tripped by David Davis.
Ollie Watkins stepped up and, although Kuszczak dived the right way, the ball eluded him and ended up in the bottom corner.
Maupay, who has scored all his league goals as a substitute, made the points safe as he rifled the ball home from inside the box to complete a satisfying win for Dean Smith's side.
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