Your household finances present a sharp bifurcation: your personal savings rate of 29.7% is solid, generating roughly £2,676 monthly surplus, yet the joint account is hemorrhaging at -79.4%, burning through an additional £1,471 per month as expenses exceed combined income by a factor of 1.8. The mathematics are unsustainable, Sir—this gap suggests either irregular joint expenses being averaged over stable monthly income, or a structural imbalance in how household costs are allocated. Your liquid position of £179,279 provides a reasonable buffer, and investments at £131,089 exceed mortgage debt at £170,323, which is prudent, though the joint drain will exhaust reserves in roughly 122 months if unaddressed. A rebalancing of joint contributions or expense governance warrants immediate review. Systems nominal. Recommend joint-account audit before next brief cycle.