Alan I'd endorse the view, why not rent for a time and see whether you really like it, perhaps even renting out your UK place? For myself I can see the sense in keeping somewhere in the UK. If however, perhaps after a time of rental, you decide to move over to Turkey - as I intend to do - I'd support Jim's advice, look very carefully at the sums particularly of owning a second place for rental, its a fixed asset that may be difficult to sell when you want or indeed need to sell it.
And yes interest rates look interesting compared to the UK, but whilst I suspect they will always be better than the UK, you can't ignore the exchange rate and the inflation rate in Turkey, compared to the UK.
So do your sums very carefully, and my final advice is if you can afford it, all costs taken into consideration, keep somewhere in the UK, if only a small flat. Good luck