Ian, given findings of your test I would agree the flasher unit does not appear to be the problem, assuming you selected one side or other with ignition on, as mentioned by Graham.

Noting that hazards work ok I would suspect the hazard switch which disconnects power to the single side flasher relay when hazards are operated but should restore when they are switched off. To prove this check for presence of +12 volts on each end of plain green cable that runs from hazard light switch to flasher unit, with ignition on and hazards off of course. A temporary ignition controlled feed to flasher unit should restore indicators to allow use of car whilst waiting for parts, assuming you prove above.

Section of wiring diagram below to better illustrate. Here it shows pin 8 as feed from hazard switch but later models show pin 1.

[Linked Image]

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone