In that case then you can ask top £££ for it if someone is willing to buy it, warranty is transferrable speak to Wisper first. Though boxed and new it will be classed as used whether ridden or not as now not direct form a dealer.
If you want a quick sale offer an inducement of a saving over a brand new one direct from Wisper, maybe 10-20% discount.
One bike shop offers only about 60% of your money back for such a deal.