Park is a production air rifle, Whiscombe is more like a custom airgun made and hand assembled by a craftsman.
What do you think a custom like a Venom Mach 1 or 2 is worth?
I'm not saying I'd pay 4-5k for a Whiscombe, but people do...
As for the double (triple on the 80!) cocking, yes it's quirky, but what about the bike chain on the Park
Also, the trigger on the Whiscombe has no equal when it comes to airguns (maybe only the German FT guns come close), and they easily achieve 12ftlbs (30ftlbs in FAC), the Park especially in .177 struggles to get 12ftlbs out of it.