Since 1834 the Channel Islands have closely followed UK mainland coinage, and the coins have the monarchs portrait on the obverse.
However it is not legal tender in the UK mainland, although the odd coin does turn up in lose change! - so can be found by detectorists (I have found two).
This is an interesting item about Channel Islands coinage, including dates that the various coins were issued.
While this is much more detailed and includes mintage figures.
Then of course there is Numista
https://en.numista.com/catalogue/guernesey-1.html (in the URL Guernsey is misspelt, although correct in the search option)
Alderney also issues "collectors" coins, but not coins for general circulation.
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