December19 is The Bigger Question Agency: an independent media planning and buying agency in London. We interrogate the brief before we build the plan, connecting media strategy to business outcomes rather than just cheaper rates. Asking whether B2C thinking could work in B2B grew Xero's market share 85% and returned a £4.07 long-term ROI - winning the 2025 Thinkbox TV Planning Grand Prix. IPA Effectiveness accredited.