Merchant Navy Uniform

I want to portray an officer in the British Merchant Navy for the promulgation of new and want to properly represent, as a remembrance of those unsung heroes of this service, I am 55 years already, so need to be right uniform for my age during the war 39/45, unfortunately I can not find info, even through the national site of the Navy? someone had an officer if so can you help or anyone i would rank badge on the sleeve of the jacket monkey and this badge on the CAP? Description lowest order please or a link to pictures or pic would be of great help, unfortunately we do not seem to have much history of the merchant and his hard work and suffering, more strong reason for me to want to portray this element of ww11, Thanks

Why not check with the few lines of commercial maritime fleet that are still working in the United Kingdom.
The uniforms that the officers wore Shipping!
It was not a uniform standard that the insignia of rank were of a standard type.
You can also go to your local Royal British Legion as they were a member of the Merchant Marine of World War II in their ranks.
If its any help, I belive the Association of Shipping is based in Liverpool.