Start recording what you find
If you are interested in marine wildlife consider helping to protect it by recording what your see, whether that is while rockpooling, beach combing, swimming, snorkelling or diving. Your local marine recorders Dawn Watson and Rob Spray would be very pleased to hear about any finds. They run Seasearch East locally which runs marine recording training every year.
… there are lots of good books to help you too!
See the Norfolk Beach Cleaners Collective page for more information on when these happen and how to get involved.