Thanks for sharing, Dougal! Since the app can only be downloaded for Windows, I've moved it to this forum. The Security forum is under the Linux & Android section so should be specific to security issues affecting those platform. Spectre and Meltdown are cross-platform but this utility isn't unless it runs on WINE?
As dougal noted below, it does run under WINE on Linux. I hadn't noticed that. So this was the right place to post it and you are vindicated, dougal! That's why I get for posting so early in the morning!