The funny thing is, I've seen so many posts/articles about how hard it is to flush a toilet in the UK, but I've never seen it.
Maybe it's because I spend my time in more modern flats/offices in London. Nearly every toilet I've seen has a button that would feel at home in the US. Once in a pub, there was that lever that I've read about, which needed to be swung with a bit of momentum, not just pressed leisurely. But even that one flushed fine, once I realized the situation. (I suppose as a man, I generally make use of urinals at a pub rather than toilets, so that may also be part of it.)
By contrast, I never saw any previous posts about this skid mark / toilet brush situation, and that's a problem I encounter every damn day.