Thanks for all your advice.
I was talking to my sisters boyfriend over the weekend about it and it turns out he has just sold the exact same guitar in the same colour. I can't believe we've never discussed/discovered this before.
The headstock is identical, his had the sticker SN which has help confirm this.
I'm never going to sell it, it's an immaculate (almost) guitar which is pretty amazing for something 20 years old.
Cheers guys.
Ross