How you doing mate?!
Dunno how relevant this would be to you but have you thought about applying for a cadetship with the merchant navy?
With you already having a HNC you would likely get a start and put throught a fast track route, which is 7 months at college then 6 months at sea completing a task book. after a few exams and sea time you would be qualified as a ships electrician which would then give you an upper hand on all the other domestic electricians as this is a desired back ground & extremely similiar.
Only thing is, is that the money is ***** poor for the 1st year atleast until you get ur ticket.
Also if youre looking to get off shore you will stand a better chance if you put yourself through a few courses such as:
BOSIET, MIST, COMPEX (for electricians)
Basically just safety courses, but legally required!
Hope this helps mate & best of luck chasing the big bucks