The Verene sale enables some observations on the current state of the market for UK predecimal proofs:
Gold and large silver proof 19thC coins (particularly 5 sovereigns and crowns) are extremely well bid. Most of these in the collection were bought by dealers
Bronzed and copper proof coins are not chased by dealers, particularly anything smaller than a penny
ultra rare coins like patterns, mules and die orientation varieties are mainly hunted by collectors and the prices are reasonable
slabbing is not required if the coin has great eye appeal and knowledgeable purchasers actually appreciate their opportunity to self grade and maybe get a bargain
Ephemera such as the original cases for the early sets are not chased by dealers and were comparative bargains in this sale given their much rarer than the coins