Oxygenating pond plant (Cosham PO6)

I’m in the process of cleaning out my little pond, which has got into rather a state. A miniature water Lily is now gigantic and has taken over. I had an oxygenating plant (I’ve forgotten its name) but that has disappeared. Has anyone got any oxygenating pond plants spare to requirements? (ideally in the Cosham area). Thanks.
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