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Amazing, thank you. I suspect the finish is many years of neglect tbh! Getting fairly close to the colour will suffice; there will only be a few of them and they'll be under the sink (you can see the gap in the back left of my photo).
Something like this should do: https://www.wallsandfloors.co.uk/earth-stone-quarry-tiles-rustic-earth-red-tiles
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That link seems to go to 300x300 ones? You want something like https://www.wallsandfloors.co.uk/traditional-quarry-tiles-traditional-red-quarry-tiles
Quarry tiles.
Edited to add: they generally come plain so might be hard to match the finish, which might be from a worn down sealant. You can use linseed oil I think, or proprietary tile sealant.