Coming back from hastings today,shall we say swiftly

,i braked hard for a roundabout and found the brakes werent up to much .Upon leaving the roundabout with a butt clenching drift(more luck than skill).
when i got back home and changed my boxers

,I had a good look but nothing was out of place.i think it was just brake fad.
I have standard discs and pads (the pads have lots left on them and the discs are ok ,they have a slight lip on them).
I dont have to much cash at the moment so any ideas on a cheap upgrade?
what pads are good (i do tend to drive quite hard)
Is it worth changing the brake fluid(it look and feels ok)
jason