Ok grazie CPA!More informally, you could also say "I didn't want to bother you."
It might be a bit old-fashioned (my aunt used to put it that way, and she died 2 years ago at 101), but it's perfectly good English.Hello.
A friend of mine,70,from Glasgow uses to introduce any question or observation by the following:
"I don't want to be a nuisance but...". Too old fashioned?