My novice interpretation of the org uk market is that unless the domain contains some pretty hefty search terms, few people will see value there. Even the likes of BestCasino.org.uk only sold for (around) £160 on DL a few weeks ago.
I probably only own 5-10 org uks so other people will have more enlightened opinions but to a reseller you are probably looking at £50 max. To an end user, who the hell knows!