Your household operates as two entirely separate financial entities, Sir—you're running a healthy 29.7% savings rate while the joint account is haemorrhaging capital at -79.4%, burning through £1,471 monthly. The joint deficit is the critical pressure point here; it's consuming roughly 8% of your personal income despite generating £1,854 combined. On the positive side, your liquid assets of £179,279 provide a comfortable buffer, and your investment portfolio of £131,089 has already outpaced the outstanding mortgage of £170,323, suggesting solid long-term positioning. The commission volatility (ranging from average £18,581 to peaks of £38,145) is manageable given your savings discipline, though it argues for tighter joint-account budgeting rather than relying on your personal surplus to cover the deficit indefinitely. Systems nominal, cash position robust, intervention threshold: joint account spending review.