Spot on info Liam. Crank pulley didnt feel loose on first inspection, but when I started strippng out found that the centre bolt only took about 20nm to undo. The crank pulley is ruined and the crankshaft itself has a big gouge in it. The front half of the front key is almost worn away to nothing and the reluctor is not only badly worn but also badly corroded on its inner diameter.The pick up is also damaged. Cant thank you enough for your help, recovery truck was booked to take it to nearest diesel specialist 30 miles away. Thanks again, Dave.