Returning to the MMA discussion. P8 is not a Multi Mission Aircraft. It is defined by the DoD as a Multi-mission Maritime Aircraft. Not just a play on words but a specific definition of a platform procured by a Navy for maritime tasks. Sensor have been optimised for maritime ops and the add on QRCs are defined as ASW SIGINT etc. The DoD is very specific because to say anything else would cause arguments with the army/ marines/ airforce
Sure you can use many of the P8's sensors in other environments but the USN has no requirement to do so. For the UK to deviate from the baseline AC will be very difficult but very lucrative for Boeing.