Re: Haha, amusing yes..
Re: simple answer to requests:
That's not an answer to an FoI request. An FoI request makes you trawl through a huge pile of documents and emails and answer the question "what have you discussed/said/decided/planned/thought about *this*?"
(Besides, to come up with that "10%" figure, you'd have to go through a whole feasibility study, project plan, and a whole pile more expensive activity. It'd take months, in itself, just to come up with a number like that, unless you pull it straight out of your backside.)
However, the FoIA contains an exemption for "vexatious requests", which are fairly broadly defined and it seems to me that authorities could get away with filing several of these in that particular bin, if they wanted to. Certainly the one about dragons.
Personally, I think the FoIA contained an own goal in making requests "free". The pre-existing Data Protection Act allowed organisations to charge a "reasonable" administrative fee for tracking down and handing out information - something like twenty or thirty quid - which I think is reasonable, while also enough of a bar to deter the most frivolous of these loons.