Inspired me to pull my c16 from out of the garage eaves.
Has been there for at least 13 odd years, unused.
Is completely untouched since bought new some time in the 90s from Noah's Ark in Stroud. Even managed to get air in the original inner tubes (rear has a bit of a leak)!
Given a quick wash, but chain and cassette need a good clean/replacing.
I have the original end bars in a box somewhere.
I assume I can get replacement shimano cables etc from my LBS
Nice looking original bike. It's a 1997, the last year of the C16R (they went back to the Clockwork name from 1998), and the first that was sold with an ahead stem and V-brakes.
I would guess that the things that need replacing after 13 years are most likely the rubber things - definitely the tubes (even if they hold air, not worth the risk of using them), probably the brake pads which will have gone hard (should work, but not as well as fresh ones) and possibly the tyres might be cracked. You might get away with the chain if there was any oil on it when it was stored, but the cassette shouldn't need replacing - just get some oil on the chain and use it and I would expect the cassette to work ok even if it has surface rust. I would have thought the cables would also be fine, but if you're confident of doing it, I would undo them, take the outers out of the stops, oil the cable to get oil into the outers, then reassemble. Might well be ok. I would also oil the derailleur pivots and spray a bit of oil into the shifters.
You haven't chosen the best time of year to get restarted, but it's a great bike and it's certainly worthwhile getting it going again.