Just check that you won't have to change the back axle if you do change to Derv. I swapped a transit 1600 petrol for a york 2.4 diesel. It said I was doing 60 on speedo........ outside truck door it was more like 38 mph. I don't know if it will be ok with just a change of gearbox.. Please check before you swap though or you will be very peed off.
How will I know?
I'm feeling nervous, first badger patrol tonight.......looking forward to it too though