We have two bike shelters at my work. One is usually pretty busy, I am often the only user of the second one. Reason being the second one doubles up as a smoking area. This doesn't bother me too much and in fact I'd rather folk were standing nearby my bike when I'm not there than not. But it never gets swept out so if you put your bag on the ground to lock the bike up it gets covered in ash. Filfy abit! Anyway this morning I chose to use the other bike shed but most of the stands (those upside down metal U things) already had locks on them, but I was first into the shed. I too leave my lock at work cos it's too heavy to lug around. Is it bad etiquette to lock a bike on a bar which already has a lock on it but no bike? What's the consensus? Just wondering. I didn't but would have if I hadn't found a lockless bar.