On a happier note then my last post, a friend emailed me this youtube video of these puppeteers, They are amazing for sure - that's three guys working the horse plus the officer all working together. And the likelihood that they knew anything about horses before starting that gig would be minimal. Pretty sure I'd lose it half way through that play - it's about the roll of horses in the war ... if that doesn't get a horse person, nothing will!
War horse puppet
(there are 2 videos I messed up somehow sorry)
War horse meets friend
P.S I also posted to Equestrian so you may see this twice.