I'm sure he does, hence his complaint. You see, Britain's nuclear deterrant is maintained by Trident. A submarine based weapons delievery system.
We have never had ICBMs - our weapons delievery system has always been sea based since Polaris. Prior to that is was Skybolt and Bluestreak which were Air based weapons delievery systems.
Yes we can nuke the Argies from anywhere on the globe using the subs, but sending one of our subs to the region is more about a little reminder about the Belgrano rather then a threat of smearing BA off the map.
On a total side note a fun fact.... the Belgrano saw action in one of the key battles of WWII.
A small prize to the person who can tell me which one.....