Proof Coins.

I don't have many coins to sell, don't use the categories much so perhaps I missed something. Please ignore my post if the subject has been raised before, or if I'm talking rubbish.

I just listed two separate UK proof coins. I found categories for COINS > "Proof Sets", >"Commemorative" and >"Bullion", the last two have no mention of "Proof" in the title. I found single Proof coins in all three although one coin is not "a set", some were not commemorating anything and I'd say that a proof coin is not "Bullion" as a proof is struck to a much higher standard.

Sellers are putting single proof coins in these categories because "Proof Sets" does mention "Proof". Many proofs are "Commemorative" but commemorative coins are not necessarily proof and "Bullion" because Proof coins are sometimes made of silver or gold.

Isn't there a gap in the categories that is causing this muddle?

Would a new category "Coins > Single Proof Coin" be useful?