How essential is it? We have other assets in the neighbourhood.
Define we……
We, as in the UK, have nothing capable of intercepting an IRBM if they throw one at Akrotiri.
Not sure whether the Cypriot NG BARAK-MX system is the ER version with an IRBM capability.
The French and Greek FDI frigates carry Aster 15/30 and can intercept short and medium range IRBM
So, until Dragon arrives, we will depend on them.
Of course the USS Ford CSG is in the area and could be located to take out any incoming.