Hmmm, assuming it’s not cracked (and a fair few Super 8’s did crack on the swing arm apparently) it’s probably worth a couple of quid, you might get more for it split it up to sell as parts…
SDH Classifieds are always full of DH kiddies looking for a bargain but they won’t recognise the frame as the classic it is (to them it will just be an old DH bike) and will value it down accordingly, maybe £300-400 if it’s in good order seeing as it’s a decade old now I reckon you might drum up some interest via Retro bike, where the users seem to be older (hence the nostalgia) and thus a tad more flush, so long as it’s mostly “period” kit and not too scratched/dented…
The old Hope brakes always find a buyer, and the boxers will probably sell for ~£150 unless they are total scrappers…
You might scrape £650 for the whole bike maybe?
Dunno people can be quite funny about 2nd hand DH bikes…