ever since they introduced the fire ban on the beach, we have been taking a drum cut in half length ways with a grate in the middle of it for the fire sit on, and feet on it that makes the drum sit about 30 cm up off of the sand (so as not to heat the sand below it, as per the old requirements). we only use heat beads and sawdust logs in the fire and have never had a problem with the Rangers. last year a Ranger asked what i was using as the fuel source, i showed her the heat beads and sawdust logs and she was happy with that. all they say is make sure you take the ash with you when you leave the island. this Ranger paid the neighbouring campsite a visit and fined them for burning timber, they obviously complained about me having a fire and the Ranger made a return visit, which is when i showed her the fuel source we used.
now in saying that, i see they have rewritten the wording of their fireban on the website since last year, so i'm not 100% sure if the same rules apply.