Oase Aquamax 14000 pond pump

Hi all, my Oase Aquamax 14000 pond pump has unfortunately packed in, am trying to find a replacement impeller for it but am struggling, its a discontinued pump, so I’m hoping someone might be able to point me in the right direction. If anyone has a spare impeller, knows where I can buy one, or has a pump they’re looking to sell for an affordable price then please let me know. Based in the Coventry area.