Yes I do mean inside, i really wanted the spark for better footage tbf, but if the Geo system stops that, there is no point getting it.
The legislation cover indoor use, you must follow the 1km rule, so it still applies 1/2 a mile from the airport perimeter if you are inside... as does the 50m from people or structures rule
CAA Indoors Use
"
Indoor use - The regulations make no distinction between flights made indoors or in the open; the whole safety criteria continue to apply. Certain hazard factors are heavily mitigated by the fact that the aircraft is flying in an enclosed environment and access to the venue can be controlled. Persons within the building, and who may be exposed to a hazard by the flight, should meet the criteria for ‘persons under the control of the person in charge of the aircraft’ or else have safety precautions taken on their account (e.g. safety netting, tethered drone, etc).
Minor indoor recreational use of a very small and light ‘toy’ drones is not generally regarded as having the same safety implications as for larger drones used outdoors or in commercial service. " The red text is not black or white, it says less risk, but it does not say it is exempt from the regs