hello Russell
Did you book for Istanbul this May / June ?
I have been going there annually since 1998, briefly the favourite spotting points are
The tea gardens in front of the Topkapi Palace near Eminonu ferry berths
On the Asian side, Kandili just to the south of the ferry berth (mornings)
Back in Europe, opposite Kandili, in front of the Rumeli Hisari castle (afternoons)
Near to the Black Sea entrance, Rumeli Kavagi, in the car park of the restaurant near the radar tower
(on a hot day you might get a free bottle of water !)
Send me a private message for more infos.
Regards, Burns of the Bosphorus