Loz
This looks like a straightforward elf 'n safety issue to me, although there may be extenuating circumstances if the offender doesn't have a gnome to go to, so:
(Pregnant paws while we consider the options)
You could look the other way
You could film the event and be content to know that the BEEB may show it for free
You could film the event and get £250 from one of those shows where things are always spontaneous when someone has a camera rolling
You could ask the government to increase funding for the national elf service so the poor soul could join his mates on a subsisided fishing expedition, rather than poke around in the garden all day.
Either way it could be a pig to solve.
PH