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Hi, you will need any of the toner 4 packs at the top of the page.
Brother standard size: https://www.tonergiant.co.uk/product/Brother-TN241-Multipack-B-C-M-Y-TN241PACK-30017/
or
Tonergiant compatible standard sized: https://www.tonergiant.co.uk/product/Compatible-Brother-TN241-Toner-Value-Pack-B-C-M-Y-RETN241PACK-86694/
Both are also available in high capacity sizes that print more pages.