R G Claughton

I've recently bought a well-specced Lupo, but despite it having its original handbooks, I can't find any reference to a small button below the rear bench seat. It has an outline of a car with concentric semi-circles inside it (like the signal strength on a computer/mobile). When pressed a red dot lights up for about a minute. Can anyone shed light on this, please? And if I'm allowed a two-for-the-price-of-one can anyone advise whether a front seat release handle that's snapped off just inside its plastic casing can be readily repaired/replaced, and if the latter can anyone suggest where I might start searching to source a replacement? Thanks in advance - I've been on various marques' forums such as this throughout my long life, and I know they're full of immensely knowledgeable, usually helpful, (sometimes scathingly sarcastic) members!