The mixed cable routing means it's a 1997 Kona of some kind.
The picture isn't very good, but if you reckon the dropouts resemble the ones below, with the stays fitting into rings on the dropouts, then it would indeed be a 97 Kilauea, as they were used only on the Kilauea, Explosif and Hot and the Explosif had diferent shaped tubes. I'm guessing it isn't a Hot. Only a guess, mind.
If it is a 97 Kilauea it is the lightest of the Kilaueas, weighing 4.3lbs for this size 18, with a frame made of Columbus Cyber. I think it's dynamically an excellent frame, but unfortunately it looks pretty bad at the moment, especially with those awful imitation decals. The market says it's only worth £100 or so, even with good paint and decals, so logically it isn't worth £70 in this state.