Ok, I’ll help him out.
My Brit friend, this is what I recommend: Contact a maritime recruiter in the UK (there are zillions of maritime recruiters in the UK ---- Faststream is good) and ask someone there to review and critique your CV. As an AB, your CV should not be over one page long. It should list your education, military service, seamen’s documents, maritime and safety training certificates, and past few years of employers. If you have a passport, vaccination record with current Yellow Fever, MIST, BOSIET, ITSO, etc., be sure to list those as well. A good recruiter can tell you what copies of which documents should be attached to your CV, if any. Presently, there are advertised job openings for UK seamen. You should find a job promptly Good luck.