I saw this a few days ago and did a little searching with no results.
This monitor was used extensively with the BBC Micro so that was where I looked. It may turn up after quite a bit of searching.
I also think that Microvitec were pretty standard across the range. The earlier metal cases monitors were used with BBC's and alike. The later plastic monitors were quite popular as colour monitors with IBM XTs and alike, in that I've seen a few before.