I suppose you've looked at getting insurance with the provisional licence that you've recently acquired, right? For provisional drivers, the premiums will be high because you haven't yet passed your driving test. You will need to make use of your turkish driving licence to get cheaper premiums. You can start by calling a few insurance companies and explain your situation to them. On the Internet (or car insurance comparison sites), you will not be able to supply additional details when looking for quotes. However if you contact the insurers individually, usually they take into consideration other aspects of driving which might help reduce the car insurance quotes. You just need to tell them you're an experienced drive with a turkish licence for 11 years but have recently applied for a UK provisional licence and then see how much they are willing to discount your quotes.