For info, the defra welfare guidelines state how much square area sheep should have during transportation.
https://www.gov.uk/sheep-and-goat-welfare --> scroll down to link to doc on welfare guidance on transporting sheep.
Shorn sheep or lambs over 26kg and below 55kg need 0.2-0.3 sq metres each.
Unshorn sheep under 55kg need 0.3-0.4 sq metres
and
Heavily pregnant sheep under 55kg need 0.4-0.5 sq metres.
P6e is 1.98mx1.21m = 2.4 sq metres, so that's 8-12 shorn sheep, or 6-8 unshorn sheep, or 4-6 pregnant sheep.
(I'm glad I worked that out as I can use those figures myself for my own sheep now in my P6e
)