Apologies, slight error in the previous post:
” … previous similar launches have resulted in a fuel dump occurring 45 to 80 minutes after launch.”
should have read
“… previous similar launches have resulted in a fuel dump occurring 45 to 80 minutes after the payload is inserted into orbit.”
The upshot of this is that observing conditions improve for UK observers with the dump now expected to commence (and be at it brightest) soon after the object clears the horizon for UK observers.
Best regards
William