but we don't.

Its fairly obvious that if we don't have a common policy that we don't have more clout, but your point i originally answered was about further eu integration giving us more clout, i would assume further eu integration would include common policy

how many times of recent has britain involved itself in events that appear to be opposed by our continetal 'partners'?
you don't just opt to have a common foreign policy, you need to agree what those objectives are.

case in point; iraq, which i supported and am thus glad could not be vetoed by javier solano.

I agree, which is why we need to move to a common policy so europe can keep us out of things like the iraq war...