Your cruise line may be able to arrange to collect your luggage to and from your home to the ship, which line is it? Or look at something like
this.
Cruises round Britain are great, we've done 2 so far. Bring rainwear.
Again, which line as regards your tux? Try
Cruise Cruises offers, discount cruise deals, cheap cruises for lots of advice. If it's Cunard you will need a tux as most of the men wear them.