Dave, my old busking mate who switched to parcel delivery, bought a used Vauxhall last month. He test drove it for 20 minutes around the block, thought it was perfect. Wrong. Last week, he got stuck outside King’s Cross at 2 a.m., rain pouring, his parcels getting soaked. The heater died when the temperature dropped, and the gearbox started clunking like a loose cymbal. He had to call a tow truck, missed three deliveries. That expert’s tip about an overnight test drive? It’s not just fancy advice. Dave would’ve saved himself a fortune and a whole lot of stress if he’d asked for one.