Thanks for all the replies
Will take another look at the hope videos and try the back bleed again
The rear hose does have a bit of a tortuous route as it comes out the downtube and up and over the swingarm
I reckon removing the caliper and letting it hang will help
I have done this plenty of times on older hope brakes no problem so seems strange I can’t get this one right
I can see the bubbles leaving the bleed nipple straight into the hose
Cheers
Kwack