Abbotsbury Subtropical Gardens in Dorset benefits from a mild sheltered location on the English South coast, where the gulf stream feeds warmer air from across the Atlantic and makes the winters milder than they would otherwise be. This makes it possible to grow some exotic plants that wouldn't ordinarily survive in the British Isles. There are fine examples here of plants from Australia, Africa, and Asia, but many of them have hardier equivalents or doppleganger that can be grown in harsher conditions in the UK, to create a very similar effect.
See Paul Cartwright's blog at GreenFingeredBlog here
https://greenfingeredblog.blogspot.com/2017/03/garden-visit-abbotsbury-tropical-planting-ideas.html?m=1
http://abbotsbury-tourism.co.uk/gardens/