Newbie - ehu in The Netherlands

[Pigriver]

Were off to Duinrell in May half term and I'm wondering in my EHU cable will work or if I need a different one. If so, which one?!
A Google seems to bring up the big round plug converted to a 2 pin socket like in a house.
Apologies if this is a silly question. This is our first time abroad in the motorhome.
Also, is there anything else I need to consider/buy?

TIA

I am sure that at Duinrell we used a standard 3 pin one.

We do have an adapter like the one you have described, but I am sure we have only used it once (possibly twice) in the last 10 years. So it can be a useful thing to have in the EHU bag and isn't very costly, but it#s not essential.