I sold my old 2003 one for £1150 earlier this year. It had 64k ish on it, a little drop damage, but brand new fairing & decals. But, it was immaculately serviced, Hel braided lines front back, recent new genuine clutch, uprated FZS1000 rear brake caliper, recent Brembo rear disc, Hagon shock, posher comfort seat, Givi Rack (no box), double bubble screen, huggers, year old chain/sprocket and 6 month old tyres with loads of life in them. I was also in London and just before ULEZ charge hit.
Don't expect much value from accessories. Big ticket service items sorted out are plus points. £1000 may be cutting yourself short, £1500 maybe achievable if the right person wants it. I'd expect some haggling down to £1250 ish.