Yep Epicyclic, I noticed that as well plus the fact that it has no reg number makes me think that it is part of a sales display for emergency vehicles from some company maybe called Eagle? I will investigate! Notice the other ambulance behind itwhich also has "Eagle" on its side.
Just found it too!
The bit of roof rack is to show the "extreme" wheel articulation that the Yeti has
Interesting Co. though by the look of it, I've always been interested in these type of specialist coachwork builders, fancied a job at Carmichaels in Worcester, but glad I didn't as they went pop at about that time.