Unless battery life is important I'd generally look second hand at laptops. I don't know about Macs (possibly not as big bargains to be had I suspect) but with Windows laptops there are always loads of business refurbs on ebay or whatever. Generally in very good condition with decent specs for £200-£300 (more if you want super powerful or super lightweight). Lenovos or Dells tend to be the best in my experience.
Unless battery life is important I'd generally look second hand at laptops. I don't know about Macs (possibly not as big bargains to be had I suspect) but with Windows laptops there are always loads of business refurbs on ebay or whatever. Generally in very good condition with decent specs for £200-£300 (more if you want super powerful or super lightweight). Lenovos or Dells tend to be the best in my experience.