Thanks sierrafery, This is what I have done so far-
1. Replaced ind. stalk and battery
2. Checked wiring to lights, earths, fuses,relays.
3.Replaced Hazard switch
4. Replaced fuse box.
5. Checked BCU connectors
6. Checked ECU connectors
7.Checked ignition switch.
All work well incl.indicators and hazards when ignition on . When I start the engine indicators work normally for 30 seconds then go intermittent.
The last thing I did was to check all connectors in LH pax fascia ,clean and reconnect.
I have assumed that this all results from water ingress which I have since sorted.
Thanks again. This is the last item in a long restoration and otherwise the vehicle rune beautifully (only 200,000Ks)