Regarding Legoland, as an entertainment based organisation (and I suspect their operations are highly professional) I would expect them to be aware of the requirements for using lasers and searchlights outside and therefore notified the CAA with the relevant paperwork to obtain prior authorisation.
I have used high powered lasers argon lasers (up to 12 watts) and pulsed Copper Bromide lasers (8KW pep) outdoors and often close (under 2 miles laterally of extended runway centreline) to airports. At all times I had complied with CAA and ATC requirements and never had any issues. Although as a professional working in this field, we were far more aware of the consequences and repercussions if we got it wrong.