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Steel garage shelving - 600mm wide x 300mm deep x 1800mm high - talk to me
BS:826:1955, loads of suppliers, many of them offer off-standard 24" widths in addition to the normal 36". Huge load capacity (up to 375lb per shelf), very adaptable, you can buy spare parts from anywhere to add extra bracing, extra bays, extra shelves. I assume they're pretty durable but as I've only had mine for 20 years it's too early to say from personal experience.
Steel garage shelving - 600mm wide x 300mm deep x 1800mm high - talk to me.
Found a good(ish) plastic version of the above but wondering if steel will allow greater loads than 20kg per shelf.
IKEA, B+Q, Screwfix, Wickes, Machine Mart and Argos have all failed me.
Happy Valentines.