£3k for a 1979 is out to lunch. (Although there is a 1979 hardtail Strat on the 'bay for £3,995 at the moment).
The key is originality. There are tons of refins out there.
Assuming that the finish is correct, you would probably be looking around the £7-8k in the UK market, although I expect this might be worth a bit more in the US at the moment.