Well that's true, you won't get it back but then it's not a terribly big ticket item. The cost of government regulation of aviation security is around the 7 to 8 million pound per year mark which spread over say, just under 40 million taxpayers is about 19 pence or 26 US cents in the year roughly, give or take. I'm not convinced anyone would notice or value that sum being given back to them.
I gather a levy of about 40 or 50 pence (roughly 65 cents) will be put on each customer but the charging mechanism isn't set yet.