It was in fact, the Right Indicator bulb was faulty, once replaced the other worked Ok
It is not a very secure securing method on the rear clusters and I had use only one of the two securing threaded studs as one had previously been damaged ( By Halfords or Garage techies). It is the first time I've done it myself. I must say the materials and build standard on this Corsa is the lowest quality
of any previouse car, I've never stopped having to carry out repairs right from 10 years ago when