I got a basic bike tools box from Lidl for £20 – has a decent (if you are sensible and not ham fisted) chain splitter, cone wrenches, allen keys (I have loads anyway from working on cars etc) and octalink bb/CL rotor tool, chain wrench etc etc. Pretty much the same as the ones you pay £40-50 for.
Then I added to it with things that were missing (eg £3 chain ring bolt tool) and some decent (eg Park or others) things that warranted it – eg external BB shell tool etc. I like park blue tyre levers too as they are nicer to use than softer ones.
Wire cutters I got some decent ones from a tool shop with the good curved jaws.
Greases etc – despite having lots of nice cheap car products i have splashed out on some bike specific stuff but look at Weldtite stuff for red teflon grease which is great in hubs and only £3.99.
Track pump – can highly recommend Topeak sprint ones – the cheapest one with the air release button – it is all you need and will outlast any cheap one and be easy to live with and not get thrown across the garden.
Oh and another good buy from lidl is the bike stand. Had a few £80+ ones and the £30 lidl one is more sturdy and feels better made. Clamp is a bit poo but that can be fixed.