Garage-type shelves, metal preferred. (Chiswick W4)

Hi, we are moving house and need to stack boxes during the process. We only need them for a few months while we do some work on the new place, so they will go back on Freegle just as soon as we have finished - probably around 3 months. Those boltless, slot-in type shelves preferred, but really we just need to stack our stuff.