How to get finer grain negatives

I, had a darkroom kit for christmas. and am really enjoying playing around. I have got a Cannon 300 (which took me a hell of a long time to save up for, But it was worth it) Anyway and am using jessops bulk film. It is Black and White iso 400. I have not had any real trouble but i feel that the negatives are sometimes grainier the i would like, I am using a jessops developer and am using a tank to develop them with. Has anyone any ideas on how i can try to get rid of some of this grain???

Thank you

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