Big House Laundry is a laundry firm catering specifically to prisons in The Great Muppet Caper. A truck departing one of Her Majesty's prisons is used by Miss Piggy in her jailbreak (clinging to the back).
Big House Laundry is located at 1 Starch Street, London. Their motto is "Servicing the Prison Community since the Spanish Inquisition."