Changed the belts to day. Took both batteries out and removed rad top hose to get better access to remove the rad fan shroud and alternator fixing bolt and tensioner.
Belts came off OK when alternator tensioner fully wound out, managed to slip belts over fan blades by slipping between blades and winding off.
Found it easier to fit fan and aircon belt by removing the idler pulley completely and refitting when new belt in place over the other three pulley's.
Now fitted new re-cored rad and set of drive belts in last three weeks, lets hope thats it for a while.