There are actually quite a few late 80's Sammo films that havent gotten a proper UK release as far as I'm aware, stuff like Pedicab Driver, Millionaires Express or Paper Marriage which are all productions not far off of the better known Golden Harvest stuff, wonder if someone will try and pick them up now.
Don't hold your breath on Pedicab Driver - Warner hold the rights and they rarely license stuff out. If anything there
might be a blu-ray release through their Warner Archive label (they have previously released a DVD through the same), but it'll be at the back of a VERY long queue and it will likely be released in the US only, so you'll have to import (all Warner Archive blus are, as far as I know, region free though, so it's just the ballache of however much all the mandatory taxes will cost).
There have been lots of rumours about Millionaires Express getting a blu release in the last couple of years, but still no news. Both 88 and Eureka have released stuff in that same overall rights package, so hopefully it's only a matter of time we get a release before the license deal runs out.
Paper Marriage apparently sits with Star TV, a company I've heard of but don't know their track record when it comes to releasing or licensing. Flicking through other films they have on IMDB, it's roughly a 50/50 mix of "boutique release likely" and "fuck no, not in a million years". This one may also depend on anticipated sales - been a LONG time since I've seen it (either HK VCD or laserdisc back in the mid to late 90s), but from memory it's one of those ones that doesn't travel too well for Western audiences (also cf. pretty much every Hui brothers film).