before totally removing the old one i detached it from the pedal and tied some strong string to it (remove through the bay and attach the string to the new one) and used that to pull the new cable through the bulkhead without removing wipers etc
i hadn't seen this reply but mr haynes told me to do this...
I managed it ok... took about an hour but it appears to be working fine
there is a 'slight' bit of slack between depressing the pedal and anything happening.. only driven it round the block though so will see if this affects anything
good news is that the clutch is still in working order
thanks for your advice guys