Did British small craft experiment with rockets as some tanks and American boats did?
Short answerYes. The boats were used for many experiments, although this exchange does not identify a specific rocket system or its results.
NotesThe answer is a clear yes but does not name the rocket, installation, trial boat, or outcome. That limitation matters because the detailed armament list elsewhere includes a flare launcher as well as offensive guns and torpedoes. Coastal craft formed part of a wider culture of wartime experimentation. This moment confirms the experiments without offering a complete technical history of a rocket programme.