Our gas oven is about 20 years old and I've just had to replace the thermostat for the third time. The part is getting harder to find and is consequently way more expensive (around £100) than it used to be. Next time a new oven might be the better option.
Looking at thermostats for modern gas ovens (£35 or so) the copper tube and phial/sender all look pretty much the same as mine. Is it possible to change that - assuming that's what fails - rather than the whole thing which includes the gas tap assembly?
Maybe it would need calibrating somehow but I'm not sure if it's pre-pressurised. Guess I could take the old one apart but that may be why it's failed if it lost pressure ...