Well done Em!
Funnily enough, I put a new lightbulb in my living room standard lamp yesterday. I had to go to the supermarket because all the bulbs I have are bayonett fittings and this is a screw.
Then I found I had a lamp in my bedroom with a screw fitting I'm not using any more.
I'm more surprised that the bulb went in the first place. I've gone all energy-saving for years. Never thought an energy savers ran out.