Thanks, Ian. It has come out well. Ilford offer a paper cut to 4x5 to fit film holders, but it seems to be available only in packs of 25. That makes it quite expensive compared to other sizes. It would be good if you could buy it in packs of 100, as it would then be around £20 (using the cost of larger sizes for comparison). It would be useful for making paper negatives, and contact printing 4x5 film or paper negatives.
I used some 5x7 paper and trimmed it to fit the 4x5 holder. When scanning the negative, I placed some thin textured paper over the top to overlay the texture onto the scanned paper negative because RC paper is quite smooth.