Gerry, The thermocouple needs to be hot to allow the burner gas to turn on. If the pilot is not heating the thermocouple then the burner will not ignite. What I do is, I take a propane
torch and I heat the thermocouple to see if it will trigger the burner gas and lite the burner. Then, if that works, I then try to adjust the pilot flame to envelope the thermocouple.
If the propane
torch has no effect I would then replace the thermocouple. They are not expensive and can be purchased here in the US at Lowes and other stores. They are universal and come in various lengths. I Take the old one with me to the store so I can get the correct length. One last thing, be extremely careful because dealing with gas can be extremely dangerious.