I'm personally up for hardening the island with decent batteries of ground to air and ground to ship missiles which are effective, have relatively low running costs and are purely a defensive weapon. If one can decimate their aircraft and slaughter amphibious landing craft / warships it will make the odds of an attack much lower. Static gun emplacements and mine fields would be OTT, and increasing the size of the garrison would be extremely expensive as well as increase the logistical difficulty of resupply.
Holding a referendum to see whether the Islanders would like to be made effectively a county of Blighty also seems sensible as then there is an increased chance that NATO would have to do something other than pursue "active defence" in Afghanistan in the event of an attack. France has at least decided to have both carriers as well as planes at the same time.
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