That was a great help, Fermi, you put me on the right track.
Sorry, no photo of the leaves, that would have, been useful. I have looked at a lot of Kalanchoe photos, and there is one that strikes me as resembling the flower in the photo very much, Kalanchoe delagoensis, also known as Kalanchoe chandelier; this seems to be a synonym for Bryophyllum delagoense, which is the accepted name.
The flowers are described like this: The bell-shaped (tubular) flowers (2-4 cm long) are either red, orange-red or pinkish-red in colour and the four petals are fused for most of their length (into a corolla tube). They are drooping (pendulous) and grouped into tightly branched clusters (10-20 cm wide) at the top of the stems (in terminal corymbose inflorescences). These flowers also have four partially fused greyish coloured sepals (5-13 mm long), a four-lobed ovary, four styles and eight stamens. They are borne on individual stalks (pedicels) 5-20 mm long.
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The plant looks interesting, but it is described as invasive in certain environments.
