Genesis mint and boxes with paperwork you are talking AT LEAST £800, probably around the £1000 mark to the right collector.
Would need photos of the Bowkett rifle to properly estimate, there are a few one offs and working prototypes out there but I’ve never seen them take much...
JB1 depending on condition I’ve seen them start at £300 and go up. I dread to think what serial number 001 went for
Dragon as new, if it’s an FT model, above the £650 mark, sporters used to trade hands for around the £400 mark but I’ve seen them go for £550 recently. If yours is as new you want to be the top of that bracket at least.
Hope this helps, Tom