some ballpark figures on the following bikes.....
1999 Sunn Urge XC UN
17" Fuji Stout lite white/blue few marks but generally very good. Head tube badge fell off, I have it somewhere
Manitou X Vert supers (red ones)
Avid v brakes
Race face cranks with OEM TA/sunn rings
Have OEM wheels but they need work, has mavic crossrides
Tomac attack grips
With that spec, i'd guesstimate at £250 ish, more if crossrides are in good nick.
1992 Scott Montana 20"
500lx group set
Wheels a bit wobbly
Haven't looked it over in a while, it lives in the shed. I did get a silver medal on it at the 1992 English Schools Cycling Association XC championships, gotta add hundreds to the value. If only it still had the AT4 bars on it!
There is the same frame for sale on here, with seatpost, forks etc for £60 I think, and not sold for a while, so fully built i'd say £120-150 ish. Given wheels might need some work.
1991 Holdsworth Electra 20"
In very good nick last time I looked, never ridden off road
Reynolds 501 (I think)
Exage 300 LX
Flex stem with Malverns scrutineering sticker on it!
Almost identical to contemporary Claud Butler Pagan, etc but with straight forks.
£80-£100 ish. Hard to say without pics.
1999 Santa cruz chameleon frame in black 17" ish
Recent disc brake upgrade dropouts fitted, originals retained
Dent in top tube
A few rubs and scrapes as per used bike frame
chain stay mostly ok as covered by thick protector since new
Depends on size of dent I suppose. Have you fitted an adaptor or chopped the old dropouts with new? Rewelded some on?
Usually about £80-120 for these frames.
1997 Bonty Privateer frame and wheels
In a right state, was a refurb project until I found the seat tube pierced.
Chris king headset trapped in frame by rusty marzocchi steerer
Bonty/Chris king wheels rear hub has knackered flanges and front will need a full rebuild, nipples corroded, etc.
Frame isnt really going to be worth much requiring such a large repair. You'd want to check the seat and chainstays as well for rust. £20-30? If you can get the king headset out, which should be easy enough with a fw days soaking in penetrating oil, they go for £40 ish second hand if in good condition otherwise.
Broken hubs not worth much I'd guess. Wouldnt hold out on much hope for an offer on them.
Pics help sell, and offer postage. Id be tempted to split as well if you can be bothered with the hassle of dismantling and endless trips to the post office.