Answer - when it is the 'Barcelona' bench from B&Q
Now pardon me for being stupid, but what on earth is the point of that? Surely two people are going to want to sit on this at the same time, but two adults, or me and my 4 year old, would be too heavy and risk collapsing it!
At no point on the packaging or the web site does it say - WILL NOT SUPPORT TWO PEOPLE
I am loath to take the thing apart and go get a refund, but this is probably what I'll have to do, otherwise everytime my inlaws or parents are round and two of them try to sit on it I'll have to tell them not to!
This is preposterous.