Originally Posted by Fabo.sk

There are several flights between IST and GYD.

On the outbound for example if you leave LHR on the early flight, you can make the afternoon flight to GYD, alternatively you can take early afternoon flight from LHR and connect to late evening flight to GYD arriving late night, but still early enough to catch some sleep if you don't have an early morning.
On the way back, you have a choice of morning departures from GYD, even the afternoon departure still gives you enough time to arrive to LON before 9pm.