I kept an eye on the Industrial boxes over Christmas and new year, the prices were pushed up to £450/350/250 for each box and the offer for top and bottom box was £350. A “payday deal” appeared after Christmas offering the middle box free if bought with the top and bottom box for £450. The March offer shows the prices slashed to half price so they are pretty much back to normal prices! Bought the middle box in the week and with a staff discount came to £93.75. Now looking for a matching foot stall so I can see in the top tray!
Ah yes, the middle box... I kept an eye out for the full stack deal for ages a couple of years back, and eventually got one. Unfortunately I'm not sure if the middle box is an improvement because of the issue you mentioned