The only thing that is going to deter any kind of attack is the reinforcement of the garrison. In this respect, we are reliant on the J2 guys to spot the signs as far into the distance as possible.
It is not beyond the wit of the UK though, through a combination of factors, not to see it coming. If it does happen, it will be too late. There is not going to be the equipment, personnel, political will or leadership necessary to retake the islands if they are lost again.
So, if they are that important, defend them properly.
One has to bear in mind as well, that rattling a sabre makes a lot of noise, like these episodes prove. Drawing the sabre and inflicting the wound, does not. A lot of this is just noise and "buggeration factor", arguably for South American domestic consumption.
Short of us gifting the islands to them on a plate, which I dont think we're quite ready to do just yet (maybe another 4 years or so
), I dont think theres any immediate threat for us to get worked up about.