I’ve got a Series III ,1973 2 1/4 petrol engine .It’s great fun ,chuck dogs /bike in the back ,after off roading jet wash it outside AND inside !
Fully comp insurance is £88 this year ( yes £88 ) ,tax is £185 –I missed exemption by 10 months ,oh well .
There are loads of forums ,make sure chassis is ok ,but you can buy replacement ones /part chassis replacement .
Mine is pretty original and I paid £1100 18 months ago .
You won’t believe how much fun you can have off road at 15mph or less ,although on road the driving experience is akin to steering a boat !