I'm talking about when ground equipment was still painted blue. The '60s. Mick and Mickey Finns were called by a Tannoy message as above. Also with QRA and Exercise Edoms.
I'm 100% certain of this. In fact, one late evening on the line at Coningsby in '69 (Waddington's runway was being resurfaced) I found a bull-horn in a store room and called my own Mickey Finn from behind the line control hut with the usual announcement. 'Attention Attention Attention. This is the Coningsby controller. Exercise Mickey Finn, I repeat Exercise Mickey Finn'.
....... and it worked fine. Un-convincing half a dozen frantic crew chiefs was something I hadn't planned for.
