Manual starter for BC tubes..!

I must have had this old pushbutton for the best part of 60 years..! The kid who lived next door to me (whose dad was a sparky) found an old abandoned bus on some waste ground, so we went and had a look. It had been burnt out, and sadly the only thing salvageable was this bell-push button. I found it again in a box of bits not long ago, and decided to make a manual starter box for our 5ft 65/80W BC-capped T12 tubes..! The 5A BS546 plug fits straight into the socket on the ballast board we use for 80/125W MV lamps, as these tubes run from the same ballast. All you have to do is hold it down until the cathodes start to glow (around 2 or 3 seconds) and then release. Who needs glowbottle starters..?!