Just received these socks from Ocado. 3-5 appeared to be the smallest size so I thought they’d be for a 2-yr-old - EU sizes are not shown. The tags include “baby & child” and “girls 2-10”.
They’re actually adult 3-5 - not quite the same thing! 
I will negotiate a refund (& attempt to return them if poss) - but it is them, not me, isn’t it...?