Further to my previous posts. Yesterday I harvested the remaining 5 frames.
In all bar the very last frame to connect there was no leakage around the box or on the bottom board slider.
The 6th frame did leak just a little onto the bottom board slider. Maybe a teaspoon or less and I believe this came about from my lack of patience
Being last to connect and well behind the others I unlocked the frame in 3 steps rather than the 5 or 6 steps on the other frames.
My recommendation for first time Flow harvest (if not other harvests as well) is to unlock the cells in 5 or 6 steps. Doing it this way a frame took me about 1 hr 15 minutes to drain.
So the first harvest is complete with 18.3 KG (nett) of honey.