Inside my thought bubble - pure speculation, I apologize - C4 was just filming at the shitoo. Most likely the garden area as you astute peeps mention. Also Davey there being a tip off, sooooo could the fake antique pergola be part of the project & C4 took some footage at Chelsea flower show ? Also with that weird dinner party / cocktail party....perhaps C4 was filming or Dan in order to submit an "audition" tape for the Lady Of the Chateau, Patrick & Stuart. sorry my mind is on overdrive.