ive had a few escort 55s and 75s and my last was a 51 plate derv. My advice would be to drop in a mondeo td and run it on WVO (veg oil). I used to put 25 litres veg to every 5 of normal diesel. Contrary to popular belief the lucas pump is fine with veg oil as long as a suitable thinner is used hence the 5 litres of normal diesel. never had any issues, just made sure fuel pump was changed slightly more regular than recommended. Went better too