I Need To Go To The Toilet - What Do I Say?
In England using the word toilet is absolutely fine with the British.
Common British Expressions (Private or Public)
WC (Water Closet)
Excuse me, where is the toilet?
Excuse me, where can I find the toilet?
I need to use the toilet, where is it?
Does anyone need to go to the toilet before going out?
British Expressions (Informal)
I need to go to the loo.
I need to spend a penny
To be on the safe side, it would be best to use the word bathroom or toilet ☺️