Just looked at the MCA website, and tried to find wht I could, and as far as I can tell the following applies;
You need an ECDIS Model course unless you have taken a navigation and equipment course since 2005. (if you are sailing on vessels with ECDIS)
Also need a certificate to show you have updated your professional knowledge for Fire fighting, Fast rescue boats, PSSC, fire prevention etc.
The MCA have not published details about these courses as yet, but I would imagine that it will be a few days wasted (sorry spent) in a classroom to get a piece of paper that is required by STCW, which in my opinion is designed to drag all down to a lowest common denominator
(STCW I mean)
There are other things for people sitting new exams, but these do not affect existing licence holders, such as the social responsibility, and human element training etc.
Also changing is the tanker endorsements, not that it affects many (or any other than me) here. It means you need to sail on the particular type of tanker, such as oil, gas, chemical, or veg oil, to keep the endorsements valid, otherwise, back to school you go! (for another fee of course!)
Finally you now need a piece of paper saying you know about security if you intend to sail on a vessel that is ISSP compliant. Again mostly covered if you have a current licence, and have been sailing, otherwise a new bit for new licence takers. (for a fee of course!)
Finally a load of stuff for engineers about high voltage courses and sea time, but I did not take that bit in!
Same for me about the fees as my company will cover them, but it does take up my vacation time sitting in classes redoing a load of stuff that I have done before. The training centers must be rubbing their hands in glee!!!!