What Catalog Choose?

The most usual reference book for British coins is the Spink "Coins of England & the United Kingdom", which comes out every year. It has more detail on varieties as well as potted histories of the monarchs and mints, but does not include mintage figures. Good auction houses will quote an S number for any British coin, and this refers to the Spink book. (Originally Sear numbers.) Most expensive option.
Coin Yearbook is good for mintage figures (where known), and is fairly comprehensive otherwise, but shorter on detail for identifying varieties. Information on Hammered coinage is very brief. Probably more up to date on values, although both seem to ignore ebay and other online sites, so can be misleading. Currently £9.95 I believe.
The Rotographic is smaller and cheaper than the Coin Yearbook, and has good detail and pictures, but only goes back to the 18th century I believe. Currently £8.95 I believe but can also be found discounted from that.

So if your focus is 1797 and later, the Rotographic book is good value. If you want to go back to the beginning of Milled coinage in 1656, the Coin Yearbook is fine. If you are going to be buying earlier coins than that, you really need the Spink book.

I hope that helps.

CorradoMLobbiam Welcome to the forum. I have the Spink "Coins of England & the United Kingdom" reference book. Another scource of information I like to look at is Numista. you can access on https://en.numista.com/ .