Has it solved it - well the camber is still there, but maybe not quite as bad as it was - but the main thing is that the spring is no longer hitting the body of the car - so although it hasn't worked perfectly as far as the camber is concerned, it has raised the body height just enough to make it useable now.
here's the before and after fitting the longer spring -
before -
DSC_0016 by
paul ward, on Flickr
after -
DSC_0056 by
paul ward, on Flickr