So, if a "database" is out, how do UK businesses effectively engage customers on WhatsApp? The answer lies in the official WhatsApp Business API and a robust, consent-driven opt-in strategy. The WhatsApp Business API is designed for medium to large businesses to communicate with customers at scale, responsibly and within WhatsApp's guidelines. It enables features like: https://b2bdatabase.co/product/uk-whatsapp-number-database/