Your household presents a paradox, Sir: while your personal financial discipline is exemplary—a 29.7% savings rate on £9,000 monthly income—the joint finances are critically underwater at -79.4%, burning through £1,471 monthly despite combined income of £1,854. This suggests structural dependency on your earnings to subsidise household spend, with the joint account operating as a drain rather than a buffer. Your liquid position of £179,279 is healthy and your investment portfolio (£131,089) comfortably exceeds remaining mortgage debt (£170,323), but the joint account dynamic warrants immediate reconciliation—either through expense reset or income reallocation. Systems nominal; cash runway stable at current burn rate, but joint account trajectory requires intervention within 12 months.