To clarify, I don't search out old books. This was pure serendipity, a chance find in the local author section of the public library. They have a selection of Macvicar's work, who I'd never heard of before.
I was instantly hooked, went through the first two in the Lost Planet series like a dose of salts, and took out the third today. Sadly, that's all they have, and there are three more in the series.