Well I checked out the hazards and sure enough switch was not working.
It was odd as the switch was new and looked fine until closer examination

Terminal second down on the left (Terminal no. 3) is melted.
When I took switch out I noticed possibly this terminal was not fully on or was possible off and intermittent.
This may have caused over heating due to high resistance but not sure.
also my hazard relay is a 9FL Lucas which has enough guts to also flash trailer lamps as well as the 6 lamps on the car so pretty sure this is OK and correct type. 8FL is for the normal indicators.
Strange thing is when I checked my spare 9FL Lucas relay switched it just left all the hazards on! So my old trusted can works well!
I check power was OK at the relay on the brown and all OK so I knew power was OK and fuses. Just as well as that would require removing my under dash speaker to get to the fuses which may not have been the best idea but so far not had any issues.
If the switch goes again then I will look further in to why but may be just bad luck on that terminal.
Hazards now working 
