Tony was the proprietor of The Guild; which originally published the Spectrum versions of many of Simon Avery's games. (Philip Reynolds, who later republished the games under his The Adventure Workshop, did many of the conversions for Tony, though)
From what I remember from back in the day, ANT is Tony crediting his images. Although I could be mistaken.
E.g. see...
Quite a few of Tony's games have graphics, such as Methyhel with graphics by Tony and (I think, his brother) Peter...
https://spectrumcomputing.co.uk/entry/6 ... m/Methyhel
There may have also been some digitising going on with some of The Guild loading screens, too.