original NOTW vinyl

Hey, i was at a family dinner today, and my uncle started looking through his old records... Found some treasures (of which i'm highly jealous, of course!) and among them was a NOTW record, from the year it was first released. It's in pretty good condition, although it's missing the album sleeve (not the cover, just the protective sleeve that is around the album inside the cover). The cover is in pretty good condition too. The corners are not pristine, but they're not bad.
Any idea of it's worth? I have no idea how rare originals are, but do you have any clue? He has a few original albums, some of them are amazing... i may have to execute a raid on his house one of these days! :D
Any help on a rough guess at the value of this would be appreciated! :)

^^ just to be clear -- as far as i know, he's not selling it, just curious as to how much it would be worth.

not so much to justify a raid...
a raid would be justified if he owned the notw promo package or even the french green vinyl :)

Not so much to justify anything unfortunately, probably £5 - £10 depending on the condition. Maybe £15 if it was NM.

Only a few pounds since the inner sleeve is missing..

Thanks all! I kind of had a feeling alright, but wanted to double check.