Finally back home thanks for your replies guys. The van didn't fail us, it has had a few wobbles restarting when it had done over 200km without a break but 20minute breaks and it started fine. This has stopped happening all together in cooler weather, the engine was never overheating when it struggled to start in warmer weather though which confused me.
The engine is running super smooth, definitely no mis-firing. I have noticed tiny amounts of fuel under the van when I park in wet conditions but can never see a source so will check my fuel lines thanks!
Loving this iveco after only using convoys since I got my drivers license, slowly trying to learn more so I can fix things myself been pretty lazy with it in the past.