Hopefully my overheating problem is now sorted. Brand new rad in place, new thermostat, given the engine a full service, new rad cap, replaced the plastic bungs with brass ones, and I have a new waterpump that would have gone on if I could have got the pulley bolts to undo. Got to get some irwin rounded bolt removers to change water pump. To be honest I don't think she really needs a new waterpump as there was good waterflow and no roughness in the bearings. I'll will change it in due course though as I have a brand new genuine part here ready to go on.
Incidently my old radiator was well past its best. Front side had next to no fins left and the rear side all the fins turned to dust and fell out when I lifted it out so having a new radiator has got to help things.