I looked at the campsite search, and non of them rang any bells, thats why I thought I'd post a message.
It wasn't a big site by any means, even when we stayed there last time we just stumbled upon it....which as I'm sure you know is sometimes the best way.
I know its to late for this weekend but I think you might mean jimmy hewitts Camping Fields just outside Benlech. I havent got teh phone no as its not on this site or in any of the books youd just have to go and take pot luck.I also dont know if they allow camp fires Ive never stayed there
Try Rhosneigr, its on the west coast though, three sites, two i can recomend, one called Shoreside and the other is up Sandy lane (forgotten the site name) both will let you have well controlled fires. The kids and I have some great trips there!!
Don't forget to leave a review of the campsites you have visited this year or last!