Thanks BB. I've been spending time looking at six horse teams and I think I now have the information I need. At least I' should be able to do a reasonable representation.
I've added some nice glossy dark brown leather harnesses to the horses. They still need another wash but they're looking better.
Left side horses.
The front horse here has the harness for the rearmost of the ridden horses.
Right side horses.
From what I've gleaned from the various sources these are in the correct positions.
I've thrown a first coat of ochre at the woodwork and done some very coarse marking out on the figures. With the four figures on the wurst I predict some heart felt anglo-saxon nouns and adjectives may stain the air blue when I progress to trying to tidy up the paintwork.