Collecting value of a Webley Mark 1 Rifle in .177 vs .22

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Our Blue Book says to add 30% to the value of a Webley Mark 1 Rifle if it is in .22. Curious the rarity of the .22 caliber in this rifle. Does this extra value hold in the U.K. as well?

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The blue book says a lot of strange things, both on prices and velocity.
If you look up "Elmek" air rifles, it says they are persumably Danish, and worth extremely much.
They were made here in Norway during the 50s, and are quite common here. Prices are usually in the 50-150 dollars range when you find them.