Not sure in UK, but a personal laser printer is a better deal for printing or even if you want color. I bought a B&W one 8+ years ago for $50, and I simply refill the cartridge. I am still on the original cartridge as I rarely print; the cartridge refill set cost me $6 delivered and I've done it once.
For technical books, I buy used e.g. abebooks.com, far cheaper, better quality and binding than DIY printing, but I do prefer e-book version on a tablet.
If you want a personal color laser, ~ $250 in the USA versus $70 for a pure B&W, and you need 4 cartridges replaced as needed, 3 for color, and one for black, ~ $50 each.
Aside, toner is carbon dust, just like pencil, and is archive quality. Color dyes are more stable today, but varies by maker, and thus questionable longevity if you store documents/books. Naturally, the paper is the next issue and rare is OTS paper archive quality; finally, document storage matters.