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I was looking for some references and knew they had a site, but this may be of interest to some. It is mainly pictures with bare descriptions so that is a bit limiting. Also, when I looked up the 1920 date (because the site would not take more info on the search section), I was looking for information on transitional patterns like the "duck-tailed milling" silver coins. I think I found them but they are not identified as patterns and had to mainly pick this out from the pictured details. Much of Bull could probably be updated from this and other pages, but wish a bit more ID had been done as they have some very rare coins that I have NEVER seen in commercial channels. There were some errors too (ie the incorrect ID of the 1926 Wood Pattern Reverse MODEL Half crown). Anyway, do have a look....

This is the correct link https://royalmintmuseum.collectionsindex.com/home

Good advice from @jelida and welcome to the forum. Another source of relatively cheap coins is local auctions. You can often buy box loads for only a few pounds. There probably won't be anything valuable in there, but it willl give you experience in sorting, identifying and grading coins. I find sorting through a large pile of coins strangely rewarding, even if there is little in there of much interest.

My little experience leads me to believe that that determination would depend upon who is submitting the coin.