Identification request

I found this while cleaning out my stuff and I think I got it while using my metal detector in Cornwall. I have looked online but I can’t find any identical headstamps. I am pretty sure it’s a 22lr shell casing and it measures 1.5 cm long and 1.65 cm wide at the widest part but apart from that I’m at a loss. I would be grateful if anyone could tell me anything else about it.

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Hello there Zo.20, welcome to this Forum.
ICI stands for Kynoch Works, Imperial Chemical Industries Ltd., Birmingham, UK. On miscellaneous .22 cartridges as your case.

You can take a look at this site. You will find back “your” headstamp in the chapter England. Don’t be overwhelmed…