I've just been reading some old UK music magazines and one from April 85 has the following quote:
The projected package deal of the top-of-the-range 520ST (that's the 512K version) plus a colour monitor and 1 megabyte disk drive is likely to sell for between £800 and £900, and if you bear in mind that the equivalent (though still only monochrome) Apple Macintosh system costs well over £2500, that's exciting by any standards. When you add on the ST's wonderful Mac-type Digital Research GEM operating system, the built-in MIDI port, the MIDI software that companies are already developing for it, and the addon keyboard and digital synth that Atari have produced for it, there's really not much doubt left in my mind about Tramiel's claim that, 'by 1986, we will have captured 25 per cent of the UK home computer market'.
I know about the Hotz Box from later on but what could they have been referring to here?