Turner said: "We had more than our share of chances throughout. I'm gutted we are out of the competition - one effort has cost us.
"Kettering had four forays into our area in 90 minutes, we had endless. It's all about finishing and scoring and we couldn't do that.
"We had possession throughout, put balls over all day. Our game plan worked to a tee - goals aside. We dominated so much it was untrue, the reality is we didn't score and lost.
"You can always say 'if one of them goes in' but it didn't. It's about scoring and finishing, it just wasn't there."