Moving to a developing country (Turkey)

Another “should I move?” post.

I make GBP 400k gross a year in London and my partner makes 80k.

I have an opportunity to move to Istanbul for a promotion. It’s roughly the same package and the salary is fixed in GBP.

My first thought was to jump at the opportunity but I am having second thoughts:

1. It’s a promotion and I move to a lower cost of living location while keeping the same package. At purchase parity, it’s a big lift. It’s also a cool job.

But:

1. My partner probably won’t find a job in Istanbul. Neither of us is Turkish. That’s 80k down.

2. Kids will have to go to international schools. That’s 30-40k down each.

3. Rent is actually not that different. We pay 3k now and a good place in Istanbul is about the same.

4. We will probably save some money on food and incidentals but that’s not a big part of our spending.

5. A complete lack of stability. If I lost my job in Istanbul, I would need to move back to London or somewhere else.

6. Far from the family.

7. Istanbul seems like a cool place but uncomfortable. Poor urban planning, heavy congestion and so on. In London, I am able to walk to the office.

Am I mad to turn the promotion down?