Successfully managed to change radiator at home with help from friend and also rsolved the ABS light issue. This turned out to be pass side rear and again sorted at min cost. The detail on identifying which sensor at fault had the problem detected in the time it took to open bonnet and remove the connector block - check the pins and close up - 5 mins max. Then bought part from non Citroen main dealer at lower cost and replaced sensor in max 1 hour allowing for getting rusted seized bolts off - 1 snapped - used friends ramp.
So thanks to all.
DublinChris