Hi Spruce. Yeah, I wondered that. But they say if you do that you need to 'modify' the generator. Something to do with the earth.
I think I may have been a little hasty in acquiring one. I went for a 240v 3 pin plug model ( Clarke 2.8kva) . Maybe I should have gone for a 110v. Like Vin explained.
I don't think you were hasty. 110V is a requirement for building sites etc for the reason Vin has said. A 110v vacuum cleaner will require twice the amperage to run it than the exact same 230v unit would do. So 230v is more convenient. (On building sites they start off with 230v and then use a transformer to reduce the current to 110v to protect the operator).
Overseas we used 220v generators on site all the time and we never earthed them. We also never used earth leakage protection with them either.
I have had a look at the 2.8KVA generator on the Machine Mart website. They don't mention anything about earthing the generator in the list of 'don'ts.' Their generator isn't supplied with an rcd either.
Obviously, you won't be working outside in the rain with your generator and you won't be working with wet hands near switches etc.
If your van is in the back of the van, the van's tyres and generators rubber mounting feet will insulate the generator from the ground you are standing on and as you say, ground spikes are next to useless.