That’s weird, because it was definitely pronounced ad-VER-tiz-mint on a lot of the '70s UK TV shows we imported to the US in the '80s. Britain is a big place, though, in terms of dialects, so you and your great granny don’t necessarily rule it out for everyone.

Out of curiosity, do you both say u-RINE and u-RINE-ull, though? Is that fairly consistent?