Old/Broken PCs for Engineering Apprentice Project (Wavendon MK17)

Hi, I'm an Engineering Apprentice in Milton Keynes. I'm building a low-cost home server (NAS) and a Minecraft server to practice Linux and networking. If you have any old or broken desktops/laptops gathering dust, I'd love to collect them and give them a second life. I'm happy to safely wipe any data for you. Thank you!