For a £250 budget, yeah, you are better off going on ebay and looking at either the used or refurbished laptops. Pretty much anything over five years old will have good support from the linux kernel out of the box, though you may need to install separate "driver" packages for the wifi chipset, but this varies by laptop manufacturer and things have gotten much better these days.
If you are going to purchase a laptop which is five or 10 years old, especially one with a lower spec'ed CPU or RAM, I would recommend running a distro that gives you either the LXDE or XFCE desktop environments. is a good example.
I would recommend PopOS, but it runs Gnome3 for the desktop environment, and if your CPU is on the slower side, it may struggle to keep up.
Office alternatives are in plenty. You can use the online O365 apps, of course, but there are propietery office suites like and which try to match the theme and functionality of Office 2013 and above as best they can. WPS is supposed to have the best office doc format compatibility, though I have never tried it myself.
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