@Lunalovegood_6
Ignore the information you have received about being able to cancel and rebook - that really only applies in N. America, certainly not in Ireland nor UK. (There are workarounds, but usually only if you have previously purchased Cruise Deposit certificates from the relevant cruise line.)
There is no problem in mentioning the cruise line. That is why C. C. has individual fora for each cruise line, and that is where you will find most relevant information.
This forum is mostly used by N. Americans and you will have to weed your way through the information to find the correct info for EU countries.
Even this thread being moved to the UK Cruiser forum shows how much the forum can be out of touch with the world outside of N. America.
However, welcome to the forum, it can be a great resource for cruise information as well as giving a few laughs.