I'd had this plant since it was a few inches tall (about twelve years ago, a three-for-a-fiver offer at Homebase) and dutifully chopped off all the sideways branches so that it would grow nice and straight (which it did).
Problem was, it grew so high it touched the ceiling, so it got relegated to the stairwell a few years ago. It didn't get enough light there, so most of the leaves fell off, apart from at the very top and on a stray branch at the bottom and one half way up.
So I have just chopped it off just above the bottom brach, repotted it vertically and will now start again.
Ho hum, we'll see: