This rifle is the one that didn't sell last time, and as was pointed out to the auctioneer the rifle was overestimated and that the information published was wrong.
It is not a prototype as listed and there were more than 400 produced, as I myself have two in the 700 range and have seen one with a four figure number.
Someone at Holts needs to do their homework, true value is between four and five hundred pounds, the last one I bought cost me 400 and was in .177.
The difference between a Park and Whiscombe is both in numbers produced and quality.
One is handmade with only 400 available and the Park was produced in greater numbers, maybe 1500 or so.
HTH 😊