MaxTehLegend :
i5 6500??? i could build a faster build than that with a £300 budget
You're asking for suggestions then tell that you can do better? What's the point of you making this thread then?
The i5-6500 is a great price/performance gaming CPU. Yeah the locked i7 is faster, but, considering you "don't want to splash out tons of money" for minimal gain in performance: http://cpu.userbenchmark.com/Compare/Intel-Core-i7-6700-vs-Intel-Core-i5-6500/3515vs3513.
You could get the unlocked i5-6500K (~£200+), but costs of the Z170 mobos that support DDR3 RAM (because you don't want to spend for new RAMs) will jack up the cost above your £300 budget.
So, if you can do better, then enlighten us with what you have in mind, instead of asking "for suggestions".