Not entirely sure of the state of gossip on a decent French Language (with English Subtitles) release of "Switchblade Romance" aka "Haute Tension". So, I emailed the UK distributors and they've replies quickly to say it's pencilled in for a Januray / February 2005 release.
That's relatively soon after the recent UK cinema release, and not entirely uncommon nowadays - but it's good to know that it won't be too long (surely) until the final date comes, and preorder listings begin to appear.
I have been tempted by the dubbed and uncut Thai DVD, and the unsubbed and uncut French DVD, and sometimes even the cut Korean DVD. But the holy grail at the moment is this UK Disc.