Moths making themselves at home? Here’s what you need to know

Anyone who's ever pulled a beloved sweater from the darkest depths of their wardrobe, only to discover it's developed a smattering of holes since you last wore it, will know: It's impossible to spot a moth in your home without feeling that shudder of dread.
What is it plotting; where's it breeding; has it laid an army of larvae munching silently through every soft furnishing within a 20ft radius right this second? For a tiny insect that couldn't look less threatening if it tried, moths pack a mighty punch.