Oh! Thanks for the information. I think that we should indicate this in the building’s keys: it is quite confusing to expect such a large building to appear but not find it on place ☺

Is it like a temporary building that is being mounted once a year? If so, we may want to add a temporary key to it, as well as a link to https://www.rhs.org.uk/shows-events/rhs-chelsea-flower-show What do you think?