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Hi there, thanks for your question. The DR-2400 is a drum unit rather than a toner cartridge. A drum unit is a maintenance item that doesn't contain any toner. The drum and the toner normally connect together and are pushed inside the printer (you can normally disconnect the toner and drum and connect your existing drum to the new toner).
However, if it is the drum that you need, you can find the genuine brother one for the Brother HL-L2310D here:
https://www.tonergiant.co.uk/product/Brother-DR2400-Drum-Unit-DR2400-97336/
If it's a replacement toner cartridge that you're looking for you can find the genuine Brother ones here:
https://www.tonergiant.co.uk/product/Brother-TN2410-Toner-Cartridge-TN2410-97335/ (standard size toner) or https://www.tonergiant.co.uk/product/Brother-TN2420-High-Capacity-Toner-Cartridge-TN2420-97325/ (high capacity toner).
If you need anymore help at all, please let me know.