Test for pre-diabetes or insulin resistance in Ireland?

They're pretty standard tests, must be a miscommunication somewhere.

Had both done by my GP about 18 months ago, confirmed type two ,I get the A1C done every 6 months , got mine down from 159 to 141 through diet and meds (forziga) , go to a different GP if you can

Yeah, any GP can do it.

The other is called a glucose tolerance test

https://medlineplus.gov/ency/article/003466.htm#:~:text=Before%20the%20test%20begins%2C%20when,after%20you%20drink%20the%20solution.

It's not clear what you mean by routine/non-routine/conventional.

These are the 3 main tests for diabetes:

• Fasting blood glucose - very common and can be done by any GP
• HbA1c blood test - very common and can be done by any GP
• Oral glucose tolerance test - done regularly but not as often as the others, usually performed in a hospital outpatient phlebotomy (blood sampling) or diabetes department, takes a couple of hours

You need to have a discussion with your GP about this as there are several reasons they may not be able to do/request the tests for you.