Lancashire Telegraph coverage
The court are now hearing from a teacher from the defendant's school, who we cannot name due to reporting restrictions.
Describing the defendant, the teacher said: "He was very quite, he was very withdrawn.
"I had a handful of conversations with him when I taught him."
The jury heard he would say yes or no, or don't know, to most questions asked to him.
The jury heard it was very difficult to have conversations with.
The teacher said: "He would always do art.
"He would doodle away.
"He preferred practical stuff"
The teacher also said the defendant loved walking and was "a strong lad."
The teacher said he became worried when he heard Lindsay Birbeck had gone missing and had seen posters around the area.
He said a colleague showed him footage from a police appeal regarding her going missing.
The teacher said he was 99 per cent sure it was the defendant.
The prosecution then asked him about how many conversations the teacher had with the defendant, who replied with "a handful".
Now being cross examined by Mr Fenhalls, the teacher is asked if they sought to find things that would build relationships, such as certain tasks.
The teacher said: "He loved walking, he loved the outdoors.
"He liked going for a walk" in all weathers, the jury was told.
Mr Fenhall asked if he ever showed aggression.
The teacher said: "Never saw any aggression from him at all towards other pupils
The teacher said the defendant was never particularly stressed at school but if he had been in a bad mood and therefore did not want to engage, he would suggest going for a walk.
The court heard the teacher say the defendant was a "hard worker" and understood the value of work.
Mr Fenhall asked if he understood the value of money.
The teacher said it never came up in conversation.
Mr Fenhall asked him about completing tasks without question.
The teacher said: "You would ask him to do something and it would be done without question."
The court heard other pupils may ask why and refuse, but the defendant would do it, particularly if it was a practical task.
No more questions from Mr Fenhall were asked.
DAY FIVE: Lindsay Birbeck trial continues