Successive reports from the UK parliament since 2022 have highlight the inadequacies of air and missile defences in the UK against a growing threat envelope. Like many European states, missile defence – from UAVs, conventional, ballistic or hypersonic missiles – has been an area that successive governments have underinvested in. Events in Ukraine, Syria, Yemen and Israel make those points with rather startling clarity. Part of the remit that the UK SDR has been charged with is a 'so what' moment on missile defence. What would good look like? What would it cost? Are we (in the UK and other European states) starting from scratch or is there an existing baseline to build on? One of the global IAMD experts and gurus in such matters is Tom Karako from CSIS in Washington DC. His pragmatism on what can be delivered, what must be defended against, and success looks like is noteworthy. As a finale, Tom offers some metrics of success of any UK announcement of a missile defence capability for the UK that is announced over the coming year.