We rarely use EHU - forgot our cable over the Summer and didn't need it.Don't leave it too long before deciding/booking, especially if you want EHU, as the site is usually full over the late May (and August) Bank Holidays with the EHU pitches going first.
I'll keep working on it - if we're too late booking we can always stay nearby and swing by.
We're not very good at booking way ahead (except the Brittany Ferry!).