Just re-bled it and found I’d not sealed the strain relief connection at the seatpost end properly when I’d cut the hose (had to replace the connectamajig with the shorter strain relief to get a 170 drop in my frame).
All bled up and it’s absolutely rapid now despite it being cold.
Cheers for the input folks.
I’m well impressed with the rockshox bleed kit with the integrated port are the guide brakes as easy to bleed?