What happens if you move abroad from the UK and ignore your overdrafts?

I live in Dubai, i owe about 4000 pounds in overdraft money with UK banks. I don't feel like paying them back, they already exploited me with credit card fees and now i'm just like meh i don't want to pay this. I heard the debt disappears after 6 years. Tbh i have no want to return to the UK but my concern is what will happen if i want to take out a loan or get a mortgage in dubai or any other country in the World… Will i have bad credit rating or will this not be visible to Islamic banks? Also what will happen if i ever want to open a new bank account in the UK? Does anyone else have experience with this?

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