IKEA wire shelving units, probably "Jonaxel". I've assembled one to photograph, they assemble to about 54x44x74cm, and there are parts for three more and a clothes rail that can span between two units. Units can stack one above another and there are clips to keep them firmly together.
There are four flat shelves included as well as two deeper baskets. There may be another couple of baskets somewhere, and if I find those, they'll be included too.
I think these are a match for the ones currently being sold, but please check the measurements carefully before buying any more and expecting them to match.
IKEA wire shelving units (Cricket Road OX4)
This offer has been gifted to someone and is no longer available.