As it's battery powered, it is sure to work anywhere on board the ship. Just remember to take a US to UK adaptor for your charger.
Yes it will, was on the Galaxy in 05, beautiful ship, no worry'.
If you are cruising with Celebrity Galaxy in March, did you mean 2008? I am cruising then also, it Departs San Juan on the 7th. The Galaxy has standard 115 U.S. Voltage, so you will need the UK adapter to plug into the outlet. One of the things I always take on a cruise is a 6 inch cord with 3 outlets on it for pluging in my things. If I am overseas, I take a UK to 115 V adapter and then plug in the strip and run everything I take. Such as my battery charger for our cameras, a clock, and My Ipod.