Yep we do that with deliveries for all 'that sort' of customer, although they tend to use fancy/grand sounding names rather than something comedic or non-descript. The highest stuff we have here requires SC clearance so I imagine it's a level below what it would be like somewhere requiring DV.
I dont deal with anything like that now but did do in the past. I built a dedicated network for a large US customer who had a UK Govt contract and DC's in several parts of the country.
That said, I only know of 1 DC (in Yorkshire) that actually prevent you from using mobile phones due to cameras and you have to leave in a little locker in reception. Other DCs have banned phones before but that was due to cell signal apparently interferring with telco kit