Looks like probably curtains for the Marathon then... A great pity.
Couple of other relics - can recall when I was 8 or so in the very early seventies, passing a Messenger or Gemini at a garage on the A30 somewhere in Cornwall... I suppose that's long since been scrapped?
Also as Schoolboy Spotter around 1978 I came across a pair of Gemini wings in the garden of a house by Redhill Aerdrome. Can't recall the reg now ('JTG perhaps?) - one of the mags at the time said they were for a scale Mossie replica... whatever became of that?!!