All,

Right side Semaphore is not popping out when indicator stalk engaged, I have checked the wiring behind dash visually and physically for loose connections. Front & rear indicators on both wings are working o.k.

Anything else I should consider ?

Check the voltage at the switch
If not check the switch
If yes try and pull semaphore out .This is tricky as you have to use a thin scredriver to lift the latch first .dont force it .
Check the wiring .
Upper wire is for light on speedo,Lower wire is live for the coil.The body is earthed .
if no good remove semaphore and clean up the screw and faces .
Check coil on semaphore is not open circuit.

Order is not specific but most probably just a bad earth or corroded terminal