I was getting bullion sovereigns until 2007, I switched to proof sets due to a few scuffed coins and had no problems until I got the 2017 proof denomination set, The £1 was faulty and I got a replacement, There were now 12 different marks on the coins. I sent them back and got a set from the post office, still not perfect but I kept them. Again this year I got my usual proof set of Sovs.(1, 1/2 1/4.) There was a large smudge on the full. I sent back for refund and have decided not to get anymore. I feel the quality control has gone despite the trail of the pyx.