The bent piece of chassis is only the lip (it just curled it over). I've had a look around the suspension mounting points and there doesn't seem to be any visable damage.

How do I go about having the geometry checked? What do they actually do??

The reason I didn't suspect its a geometry problem is that fact it still drives ok....and with it being a braking problem it seemed rotational. I was under the impression a bent chassis would just meant it pulled to one side under power/braking rather than vibrate?? (I'm no expert though).

My mate reckons this problem didn't start until a few months after the car was 'Fixed' after the accident.

n.b. There is no pulsing coming through the pedal under braking.