Hello! So, NORFED, Engelhard, and Johnson Matthey all have high premiums. These probably wouldn't have a very high resale value because of these high premiums since most dealers will want to buy back close to spot. Generic silver rounds are probably a better way to go if you are only looking for resale value.
Because you like government silver, you might want to consider random silver coin listings. Retailers will usually have government-backed silver under generic listings, so you can always look for those. The titles might say something like "World Coin (Random)" or "Silver Coin Random Mint", but not every listing will give you access to a high quality coin. Some might be scruffy or have abrasions, so always read the product description. These types of listings should all have lower premiums for the most part. Hope that helps!
Backyard Bullion are you still doing the collections from Europe VAT free? I have my stack now but when the drop happened on Tuesday I was thinking if it goes back to £15 and I can get a big purchase to average down it might be better going through you than Baird to save the VAT? Feasible?