In a surprise move (well it surprised me based on what I had read earlier) Arrow Films have actually included Trapped in Lust in 1080p HD on their new Branded to Kill Blu-Ray. DVDBeaver has some screenshots from the disc here towards the end of the page.
I don’t think it looks very good to be honest, perhaps barely better than what a DVD could do but at least it does seem to actually be HD and not simply an upscale. I’ll take it.
As I said, the movie is only included as an extra on the new Arrow Films Blu-Ray of Branded to Kill. The disc is out on 28th of July in the UK.