These 5 photo's show her entering Devonport on Friday 19th June 2015.
These quite small boats are often seen coming in and out of port as they assist with F.O.S.T. work ups for our A.S.W Frigates.
There can also be found, on the "Link" provided "HERE", a fairly comprehensive "Wickipedia" article concerning this class of Submarine. It makes for interesting reading, and I would advise a visit.