Please can someone advise me. The rhs indicator is working fine on the Eriba puck but the
lhs indicator does not work. Could this be a fuse issue or a loose wire issue. Have changed the bulbs
And this did not resolve the issue. Any advice greatly recieved. thanks

It 'could' be all sorts of things and probably best to work through a process of elimination. You've already tried a new bulb (did you test it first as there's the possibility it might be faulty from the off). Then check the contacts in the bulb holder and its connections. Probably best done with a meter to check if current is getting through at each point.

Is it a 7 pin socket on the car? If it is then its quite common for the lh indictor pin to close up due to how they get unplugged, resulting in no lh flasher. Try opening up the indicator pin with a knife or small screwdriver.