Actually, I was thinking about this, and in your situation if you started using Skype, you can also buy a UK telephone number from them - then, people who don't have Skype (family members and friends in the UK) can dial your UK number on their 'normal' home phone and get through to you in Turkey.
That means, if you use your mobile for local calls, you actually wouldn't need a Turkish land line at all
It also means, people in the UK who phone you on your UK number only pay the price of a UK call, not full BT international rate