In the 73 years since the end of WW2, and thousands of operations, this is only the 2nd time the RN have had a specific clasp awarded.
Re, the Yangtse clasp, it wasn't just the Amethyst that was awarded it either. Black Swan, London and Consort also qualified.
Fun-poking aside. I think they deserve the clasp. Floating about in a tin target isn't my idea of fun.