At home the Pirates are traditionally strong and whom are due to welcome back one of their riders (Skornicki) who has recovered from a broken wrist.
For the Bees reserve Andreas Messing is absent from tonight, still nursing tyre burn injuries from a crash last week, so his place is taken by Bees Number 8 rider Ben Barker.
If the Bees can progress through this tough semi-final, they will meet the Lakeside Hammers who have gone straight to the final by virtue of having scored the highest points in the group stages.