Not all ballistics missile are created equal.
The Type 45 Astor 30 Block 1NT (or maybe 2) upgrade offers enhanced defence against the shorter range ballistic missile that navies throw at each other. Even Astor 30 Block 2 will be useless against the big league ICBM’s and SLBM that Poo-Tin, the lovely if highly venomous Simonyan (RT Chief editor) etc keep threatening to export to us in the U.K.
To stop these nasties we need the IAI Arrow 3.
https://en.m.wikipedia.org/wiki/Arrow_3
Hopefully we get our order in, just after Germany and before the queue gets too long.