Can anyone help identify where this shell casing is from

Hello everyone, Unfortunately an old army veteran passed away in our village recently, he was a colonel in the British army. His family are selling his house and are trying to get rid of his possessions, my father was the care taker of his house and so they asked him to take anything he wants, and the rest they will throw away. He brought this shell casing home, and since I was in the artillery, he was hoping I may be able to tell him what it was from, unfortunately I am unable to identify it

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