Well, I bled the system again today to double check - clear coolant coming out of bleed valve on stat housing and rad - and the rad seems to get hot all the way up. But the engine does seem to be getting hot pretty quickly - leaving it idling for 5 mins, the fan kicked in twice and it's pretty mild today.
Had a look on brickwerks and rad are 130 quid.

Currently 80 quid at ECP but dunno how good they'll be.
Won't get chance to change it before my trip anyway.
Got a slight leak too at the engine end from the curved hose that goes between near number 3 cylinder and the stat housing. Will keep an eye on it.
"our doubts are traitors, and make us lose the good we oft might win, by fearing to attempt" Mr W Shakespeare
1990 VW T25 Transporter
1.9 DG 78ps
LPG'd by Gasure