Thats not harpoon SSM but a deck crane. For the fearless class,
the equipment fit is not standard throughout, and some of the
vessels have unique equipment. For eg, Fearless itself has got a
radome fitted on the fore of the main mast, while Brave is fitted
with a towed array sonar.
Don't worry, this is not classified information, you can check it
up in Janes Fighting Ships.
PS: Fearless was shown to the public with the additional radome in
the navy open house back in 2001. 
