Harrad scored twice in the last 10 minutes as the League Two club came from behind to record a famous victory.
Gary O`Neil had marked his return to the Boro team with a fabulous free-kick to give the npower Championship club the lead just before the hour mark.
O`Neil, making his first appearance of 2011 after illness, put the ball in the top left-hand corner from 25 yards out after Leroy Lita was brought down by Russell Penn.
But Harrad stole the headlines with two tidy finishes. The first came after 82 minutes when he turned home Penn's cross from 12 yards out and then he smashed a shot past Coyne after Scott Malone's free-kick was deflected into his path.
Source: PA
Source: PA