No idea about it's use in the US, but I know the phrase "sunscreen" isn't in use here. We know what it means, like many other Americanisms due to television but we don't use it ourselves. Maybe some Brits will say sun cream, but that's as close as it gets. I've never known it as anything other than suntan lotion personally.

About 'U'... Americans have something against the letter 'U'. You all have an incessant need to remove it from words where it was perfectly acceptable for it to be! Poor 'U'... gets no love.