Making Biscuits

One (actually several) of the floorboards on the landing are split.  This one needed fixing and it's where the bright spark of a central heating installer had cut out the joists to run four large pipes down the same floorboard length, leaving basically nothing to support the floorboard.

Resorting to biscuiting the joint, and reinforcing it with thin ply underneath, and considering metal pin reinforcement once this has all set.