Can a British Shorthair get used to guests visiting regularly?

Absolutely, they can, but it really depends on their personality and how you manage their environment. British Shorthairs tend to be more reserved and observant, so forcing interaction usually backfires - instead, let them approach guests on their own terms, like having a high perch or a quiet room they can retreat to when they feel overwhelmed. I've seen it work best when you keep a calm, predictable routine around visits, because the root of their hesitation is often about feeling safe and in control of their space.

Depends on how you set the stage for them. I live in a small apartment, and my British Shorthair eventually learned that visitors mean extra treats and chin scratches, but only after I stopped trying to force him into the living room. Giving him a dedicated high shelf or a closed bedroom to retreat to when the doorbell rings made all the difference - he comes out on his own terms after the initial chaos settles, and now he even patrols the coffee table for dropped snacks.