Well sometimes they do, sometimes they don't. The Prince Edward was dark for 6 months before Poppins to allow for refurbishment. The Prince Of Wales went dark for a year almost to be refurbed. I'm trying to think of a dark theatre in London that's not being refitted though and I'm coming up short.
Nothing precious, plain to see, don't make a fuss over me. Not loud, not soft, but somewhere inbetween. Say sorry, just let it be the word you mean.