Bosnia is actually operating out of a disused metal factory, not an airfield; basic but admittedly not as austere as a field location. We have operated out of field sites a number of times without any significant problems though.
The gantries you see around the aircraft at Leeming are a health and safety thing because it's so tall... as I recall, the servicing is done in a hangar full of tornados in bits and the Merlins seem to spend less time there than the jets!