Why not?
What purpose would that serve? Do you have other gas appliances in the place?
Why not?

I am open to constructive advice

1. Already mentioned.1. Get carbon monoxide alarms.
2. See if friends etc. are able to successfully light them, or if it is only you who has these problems.
3. Post a photo showing what you are blowing on through a straw, so that we can determine whether it is broken or not.
As my problem is that the gas does not stay on (see above) (affecting two different heaters), perhaps the cause is low gas pressure causing a weak flame which cannot heat the thermocouple to the required temperature.
3. Impractical. The heater is freshly-installed. If it is broken it must have been broken by the fitter or beforehand, which seems very unlikely. What people were doing onI don't know but the solution there no longer works for me anyway.

1. Already mentioned.
2. It solves nothing.
3. Impractical.

I am open to constructive advice
I don't know how one goes about getting the gas pressure checked or whether it is even possible. If there is a steep fee for this to be done, I probably would not proceed
Switch the thing off and stop messing with something dangerous as you've already been told many times.
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