Ok this is embarrassing - always best to have tester on AC volts not DC volts...
Got 240 at the back of fridge now that the tester is in correct mode.
then turned selector to AC and tested element pins and shows 240 getting to the element.
Tested element the other day and it was showing correct resistance so appears it’s working too.
So all appears fine except not cooling.
At home van is still not perfectly level so might just try get it perfect and try again. Would be funny (as in it won’t be) if it is just the level.