Thanks guys for your help so far.
I have replaced the plugs and leads and replaced the Coil pack and re-mounted it. All genuine Bosch parts.Only 1000 miles ago.
The Crankshaft sensor was re-routed and located well away from the exhaust.
After replacing the crankshaft sensor, the first time, I drove the car for about 6 miles. Started and stopped it about six times on the route. When the paperclip test was done it read 19. Car ran rough. As if it had a hole in the downpipe (doe not).
Drove the car again for another 10 miles a day later and did the paperclip test again - fault code 19. When reversing it into the garage it stalled and would not restart.
A new Crankshaft sensor has now been fitted but I have not fired it up more that three time to see if the fault code disappears?
I will continue to restart it a number of times but I am reluctant to try to take it for a run just yet as I have to replace all the wiper mechanism etc.
Could it be the ECU?
I will recheck the plugs and leads - would fault with them bring fault code 19?
Your help is really appreciated as I am lost

Thanks guys.