Looking at the horses he beat at Southwell:
Square Necker is the only real improver having won twice afterwards.
Tripoli Flyer won at Kempton over 1m4f and is rated 76 on the Flat.
Daddy Long Legs won a Ballinrobe Conditions’ Hurdle and a Killarney Beginners’ Chase.
The rest struggled badly in their next races. I really don’t see him as a genuine G3 performer on turf and he’s almost ten.
Collier Hill won a Canadian International and a HK Vase at eight, Yavana’s Pace won a German G1 at ten. Both horses were ultra tough and battle proof having raced 45 and 74 times in their careers. I don’t think CH has that kind of class this late in his career.