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Hi Paul, the two printers both take the HP 963 and HP 963XL ink cartridges. You can buy all 4 inks in standard size here:
https://www.tonergiant.co.uk/product/HP-963-Ink-Cartridge-Multipack-B-C-M-Y-3JA26AEPACK-99542/
or in Extra Large here: https://www.tonergiant.co.uk/product/HP-963XL-High-Capacity-Ink-Cartridge-Multipack-3YP35AE-99537/.
If you'd like any more help, please let me know.