I was pottering around on Amazon when I noticed a great deal. Two Echo Dots and a smart plug for £37, so I bought one.
Setting it up was very simple, and then I put my bedside lamp on the smart plug. So now when I wake up at night, I don't have to grope for the light switch - I say "Alexa light on" and I can see.
So I went back to the web site and ordered an Echo Flex plus smart plug for £17. The Flex is just like the Dot, but with a tinny speaker.