Cool. I've only been to London once, but I distinctly remember being disturbed by how dead everything was. I'm not sure how accurate the stat, but I recall Table Mountain having more floral species than the entire UK.
Yes, but Table Mountain has ridiculous floral diversity. There are widely considered to be six floral kingdoms [0]: the northern hemisphere, the tropics, Africa and southern Asia, South America, Australia, the Antarctic, and the tip of South Africa. My (probably incorrect) understanding is that each of these is similar to the others in floral diversity.
[0] https://en.wikipedia.org/wiki/Phytochorion