Returning faulty goods

[Si]

CJ made an helpful comment here:
viewtopic.php?f=5&t=30747

and so I've pulled it out and put it in too good to lose:
viewtopic.php?f=26&t=30770

If you have any other helpful info to add to that thread then either add it here or let me know and I'll add it on. Hopefully then, when we get a query about returning stuff to shops, or on buying on line, we will have a ready written resource to point people at.