I need to convert some of my cash into silver. Unfortunately the VAT on silver is a bummer! So instead I wondered if I could buy some pre decimal coins. Thing is, I don't want to get caught up in buying rare coins, I want to buy coins worth closest to scrap. For this reason I think perhaps pre 1920 half crowns might be best, being >90% silver so I can melt them down. But where can I buy them in bulk?