Due to traffic decending in to a satelite airfield on our western boundry I couldn't launch a DH8C on a left turn off 03L but had a C208 on a right turn to depart so told the C208 to line up ahead of the DH8C that was already lined up using a TWY that enters the RWY 100m ahead of full length (J for those who know JNB)
The DH8C remarks "We'll keep the park brake on so the propwash won't blow us back"